Floating Applet
i need to know how to make my web page form hide the address bar , you know....when somebody go to my web, just autohide the address
There are a number of reasons i want to put my applet in its own window. One reason is positioning not in the sense of location but in the marketing sense: i want my applet to seem autonomous. Some applets are little widgets that live in a page; other applets are their own entity, separate from the page they came from. The user can close the browser window and keep using the applet.
In some cases, the best thing to do is to allow the user to choose. They can use the applet inside the window, or they can pop it out into its own window if they don't want their desktop cluttered with a large Web page.
there is a technique for making your applets floatable that is, for giving the user the option to pop an applet into a floating window. And we'll design the API so that i can make my applet floatable with a minimum of fuss.
how can i use this technique in web forms ?
how to modify our applet so that the user can, at any time, pop it into a floating window, or pop it back into the web page it came from. This is going to require what kind of user interface ?
You can only decide when the applet starts whether it will be in a seperate window or not using the separateFrame parameter in the formsweb.cfg. You cannot "pop" the applet out of the browser and place it back dynamically.
Regards,
Robin Zimmermann
Forms Product Management
Similar Messages
-
PersistenceService denies permission when running an Applet
I'm converting an application that uses JWS to run inside a browser. Ok, so it's not just a matter of changing <application-desc> to <applet-desc> (which is just about the only change I made to the jnlp), but the problem I'm getting is not one I expected.
try {
URL newURL = new URL(newURLBase);
InputStream is = ps.get(newURL).getInputStream();
userProps.load(is);
is.close();
} catch (FileNotFoundException fne) {
// nothing to do
} catch (Exception e) {
// any other error is bad
Globals.nonFatalMsg(null, classId, propsFailureMsg, newURLBase, e.getClass().getName(), e.getMessage());
}This code is throwing a MalformedURLException. (ps is an instance of PersistenceService). The Message returned by getMessage() is that access to persistent data was denied for the URL.
This exact code works perfectly well when run from the desktop application. I'm serving the same jar for the application and the applet. So the URL in newURL is exactly the same for both the application and the applet (I'm serving them both from the same IIS web site). Just the HTML and the JNLP are different.
I thought JWS applets and applications run in exactly the same sandbox. And I thought PersistenceService didn't need any kind of permissions. (Although the JavaDoc does say this can happen.)
Could this be a Browser issue? I get the same result in FireFox and IE. Could it be a java.policy issue?
I'm running 1.6.0_20.Doctor_Dad wrote:
I converted Andrew Thompson's JotPad application, which illustrates the use of the Persistence Service in a JWS Application, to run as an Applet and got exactly the same result.
From which I can only conclude that the Persistence Service doesn't work with Applets.
Has anyone out there ever used the Persistence Service with Applets? Short story, no. I had your post flagged from when I first saw it, thinking "When I get time.." - but had not found any time yet.
I'll check the Bug Parade to see if this has been reported...Good idea. It is not quite clear how a variety of the services of the JNLP API should translate to embedded applets. These would namely be.
- SingleInstanceService // not an applet's right to control browser instances
- BasicService.showDocument(URL) // replaces the applet page or opens new browser/tab?
- IntegrationService // 1.6.0_18+ - shortcuts and menu items are not appropriate for an embedded applet.
I was about to include the PersistenceService in that list, but ultimately it makes every bit of sense to allow embedded JNLP applets to have access to serialisation between runs. The older methods of applets storing data are now probably blocked to the JNLP embedded applets (e.g. creating a cookie).
If you cannot find anything in the bug DB, please raise a bug report and request the documentation address all these areas.
Edit 1:
By 'bug report' above, read 'request for enhancement'. Whether it is a bug depends on Sun's expectation of what they wanted the API to do. ;)
Edited by: AndrewThompson64 on Jun 15, 2010 10:06 AM
Edit 2:
BTW - did you try it with a free-floating applet as well, or just an embedded applet?
Edited by: AndrewThompson64 on Jun 15, 2010 10:47 AM -
Components Resizing to follow width of applet
Hi,
does anyone know how i can stop components from resizing to follow the width of the applet they are in once i have grabbed the applets edges?
Thanks
Richard.Darryl.Burke gave some excellent advice.
Still, I am prepared to go out on a limb and make a WAG that you are talking about a floating applet.
This occurs in three cases..
1) The applet is in development/testing and launched by applet viewer.
2) The applet is deployed, and launched using webstart (also shown using applet viewer).
3) The applet is targeted at a 1.6.0_10+ VM, and has a JNLP file specified - so it is dragable.
In the first case, it is irrelevant if the applet will become a 'plain old embedded' applet, which is (usually) not resizable.
In the second and third cases, you probably need to look to the layouts used for the components. To prevent the components from resizing, either a FlowLayout or BoxLayout would probably be required.
As an aside, one way to indicate interest in a solution is to add [Duke stars|http://wikis.sun.com/display/SunForums/Duke+Stars+Program+Overview], though DB's advice will get you further. I recommend doing/acting on both.
Edited by: AndrewThompson64 on Aug 28, 2008 11:05 AM -
Writing applets that read files hosted on a webserver.
I have a java applet that I need to be able to read files on the webserver. IE open and render images. I know ultimately the user will end up downloading these images that are hosted on the websserver, but the java applet is set to read from it's local directory, for example, when I open up a text files, I use the path someFolder\someFile.txt. If the applet was placed in the same folder as someFolder on the webserver, how would I set it up to read from there opposed to on the machine executing the java code? Would I have to force the user to download all the resources, in thus case, wouldn't I need to to have the applet signed?
++++ to everything by malcolmmc (use class.getResource())
Jeremy.W wrote:
...I could perform a CRC check and compare the archives with the ones on the server, but it still means I'd need to compress the archives manually every time an update is made to the files on the server.I am not sure whether you are concerned with the effort of doing this from your side. If so, use Ant to make your ..war file or whatever and just upload it (and restart the server?).
If it is the archives (Jar or Zip) updating on the client that is your major concern, then I would definitely recommend the JNLP based option, which gives the client not only automatic update (the JWS client manages the time checks with the server), but if you want to go that far, direct programmatic access to the download API. I made a crude example (never properly finished) of downloading resources using the JNLP APIs DownloadService. (Though the standard 'auto-update' is known to be quite effective).
Oh, and.. Of course, if you have a Java enabled server, the download servlet is known to be best for updates, incremental or otherwise.
Does this applet really need to be embedded in a web page at all? JWS has offered these things to free-floating applets since Java 1.2, it is only recently an embedded applet could hook into the JNLP API.
As to the 'Zip' archives of resources. Some points:
1) It pays to split them up, especially if resources are likely to change frequently in one, but rarely for others. If you do that, webstart ensures the user only downloads the updated Jars. The only way to achieve a class/resource refresh in a conventional embedded applet ('plugin1') was to flush the class cache which would force refresh of all classes/resources.
2) Splitting the archives according to type of resource can provide benefits in that the Jars can have different compression levels appropriate to the format.
3) I would recommend deploying all resources, whether classes or other resources, in Jar and not Zip files. Sun has decided that no Zip will be checked to see if it is digitally signed, so Zip archives can cause problems for apps. which might need extended permissions (if it ever comes to that). -
Installing extensions in a user folder (not in a system folder) - possible?
Hello,
I suppose this is an old question, but I have not been able to find any answer in the forums (probably I used the wrong search terms).
If this is the wrong forum to post this topic to, please suggest me a better one.
Question: in the context of using the Java Plug-In, is it possible to install Java extensions in a user folder, rather than in the default location <javahome>/lib/ext ?
The background of the question should be clear: installing extensions to the usual location requires running the browser "As Administrator" under Windows Vista and beyond.
TIA to all volunteers,de_facto wrote:
I mentioned the Java Plug-In, as the application I am referring to is in fact an applet.The Java Plug-In more recently applies to both JWS apps. and applets. In fact, JWS services can even be used in an embedded applet (they could be used in free-floating applets since Java 1.2). See [JNLP Support in the New Java Plug-In Technology|https://jdk6.dev.java.net/plugin2/jnlp/] for details. -
Hello,
Im looking for the possibility to switch JavaWS to an older one and let the newest Java at the system stay.
More exactly: Company policy always roll out newest java to client computers but one application runs with an older version (1.6.0_06) only.
It would be helpful first to switch the browser to the 06 Version first without de-install the newest version. Any suggestion?
Thanks
KlausKlausGre wrote:
..I’m looking for the possibility to switch JavaWS to an older one and let the newest Java at the system stay.
More exactly: Company policy always roll out newest java to client computers but one application runs with an older version (1.6.0_06) only.
It would be helpful first to switch the browser to the 06 Version first without de-install the newest version. Any suggestion?The more times I read your question, the less sense it makes to me.
What is the version of Java used in the browser matter, unless you are refering to an applet?
If you are launching an applet using JNLP, it would either be free-floating (no browser) or 1.6.0_10+ (post 1.6.0_06).
If deploying a free-floating applet or frame using JNLP, use the typical [JRE micro-versioning|http://pscode.org/jws/version.html#micro] that comes built into JWS. -
Floating boxes applet with drag events need click event
I Have an applet cobbled from the net & modified. Is works but needs one major event added. It draws "Graphics.drawline" boxes with a text "String" inside each box ( the text string represents an URL location). These "boxes" are objects which are "draggable to other locations on canvas & therefore can be independently positioned by user. Each box redraws itself periodically to a slightly different screen location & becomes stationary after a 5 or 6 seconds. The point is, all of this "drag & mobility" behavior must remain intact & is not part of the "problem task".
Task: Need to have an "event" behavior added in one of two ways ( or a 3rd way if there is another ) whichever is quickest/ easiest. "Clickable mouse events" must be added to each box. ( boxes are built in a loop so adding to one will add to other locations & create as many "buttons" as there are boxes) . At each box's location, clicking one box should be an event which fires & clicking a different box should be a separate event which fires. Separate , so that URL location can be "hotlinked" to each box. That URL is currently displayed in the boxes (visible when running applet).
1st possible solution: Exchange these "boxes" which appear on canvas into clickable event "Graph panel.buttons" ( for example or some other clickable object) which maintains existing "drag" behavior of boxes. These buttons must each have "clickability" with mouse events to enable placing "getAppletContext. showDocument()" code with these events ( e.g., "hotlinked" to http locations).
or
2nd possible solution:. The drawstring boxes are currently dead string text with no event model other than the "drag" feature associated with each box. Must add an additional mouse event behavior to existing boxes so they are "clickable" ( or text inside is clickable) and can then execute "showDocument()" URL when clicked independently.
Maybe there is a #3. I don't know what that would be. Open to try anything without losing the drag & placement mobility of existing boxes.
These "boxes" could be images, or event buttons - doesnt matter.
Not sure if #2 is possible & have not been able to accomplish #1. Must stay within existing AWT framework so IE browsers can run it natively ( which of course IE cannot run Swing graphics unless a Sun plugin loaded ).
Applet is a single file ( creating 4 classes).
html file (which invokes it) passes a string param which is broken into above noted URL strings in each box.
Running this applet, you see a "button" event ( at base of canvas labeled "NewUrl" ) which pops up an url location when clicked ( using "showdocument"). This button is not attached to locations or text of each box object ( which is the "task" to accomplish) . The button does represent the kind of event behavior which each "box" should have when task is achieved. So the box can be exchanged with buttons or the boxes can be imbued with events to hyperlink like a button.
In spirit of solution #1, here is the bonehead attempt I tried which did not work: copied entire "if" block of logic from the button event (sited in preceding paragraph) into region of code which builds boxes ( "for" loop of "drawstring" method).
"g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());"
I copied all the "if" block of logic for button creation into the area immediately after the above line ( for loop which builds the boxes). Hoping that I could create buttons with events, along with all the boxes (which are getting created using "drawstring" above in a "for" loop). These "buttons" must also have positioning info of each box to appear in different locations on the canvas. Positioning data is not in that "if" block of code but it would have been a start to get the multiple buttons created ( even if all drawn in one spot). The "if" code block I've provieded for an example begins with the line:
" if ("NewUrl".equals(arg)) { "
and ends with with lines:
" return true; "
" } " //< -- end of above if block
This full "if" block can be seen in the listing below:
This "if" block creates the "NewUrl" button. Of course, I got a bunch of errors when I tried to copy this block to the above location:
variable: "arg" "not found in class GraphPanel".
methods: "getcodebase, showstatus, getappletcontext()"
"not found in class GraphPanel".
----------- The applet code in total follows next
Here are both the java & htm complete source.
import java.net.MalformedURLException;
import java.net.URL;
import java.net.*;
import java.util.*;
import java.awt.*;
import java.applet.Applet;
import java.applet.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.*;
class Node {
double x;
double y;
double dx;
double dy;
boolean fixed;
String lbl;
class Edge {
int from;
int to;
double len;
} // eEdgeCla
class GraphPanel extends Panel implements Runnable {
Box box;
int nnodes;
Node nodes[] = new Node[100];
int nedges;
Edge edges[] = new Edge[200];
Thread relaxer;
boolean showit;
boolean random;
GraphPanel(Box box) {
this.box = box;
} //ebox
int findNode(String lbl) {
for (int i = 0 ; i < nnodes ; i++) {
if (nodes.lbl.equals(lbl)) {
return i;
return addNode(lbl);
int addNode(String lbl) {
Node n = new Node();
n.x = 10 + 380*Math.random();
n.y = 10 + 380*Math.random();
n.lbl = lbl;
nodes[nnodes] = n;
return nnodes++;
void addEdge(String from, String to, int len) {
Edge e = new Edge();
e.from = findNode(from);
e.to = findNode(to);
e.len = len;
edges[nedges++] = e;
public void run() {
int i3=0;
while (true) {
relax();
if (random && (Math.random() < 0.03)) {
Node n = nodes[(int) (1 * nnodes) ]; // no
if (!n.fixed) {
n.x += (100*0.02) - 50;
n.y += (100*0.02) - 50; //
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
break;
i3++;
} //ew
} // epublrun()
synchronized void relax() {
for (int i = 0 ; i < nedges ; i++) {
Edge e = edges;
double vx = nodes[e.to].x - nodes[e.from].x;
double vy = nodes[e.to].y - nodes[e.from].y;
double len = Math.sqrt(vx * vx + vy * vy);
double f = (edges.len - len) / (len * 3) ;
double dx = f * vx;
double dy = f * vy;
nodes[e.to].dx += dx;
nodes[e.to].dy += dy;
nodes[e.from].dx += -dx;
nodes[e.from].dy += -dy;
} //efo
for (int i = 0 ; i < nnodes ; i++) {
Node n1 = nodes;
double dx = 0;
double dy = 0;
for (int j = 0 ; j < nnodes ; j++) {
if (i == j) {
continue;
Node n2 = nodes[j];
double vx = n1.x - n2.x;
double vy = n1.y - n2.y;
double len = vx * vx + vy * vy;
if (len == 0) {
dx += 0.02;
dy += 0.02;
} else if (len < 100*100) {
dx += vx / len;
dy += vy / len;
} //ef3a
double dlen = dx * dx + dy * dy;
if (dlen > 0) {
dlen = Math.sqrt(dlen) / 2;
n1.dx += dx / dlen;
n1.dy += dy / dlen;
} //ef3
Dimension d = size();
// f4
for (int i = 0 ; i < nnodes ; i++) {
Node n = nodes;
if (!n.fixed) {
n.x += Math.max(-5, Math.min(5, n.dx));
n.y += Math.max(-5, Math.min(5, n.dy));
if (n.x < 0) {
n.x = 0;
} else if (n.x > d.width) {
n.x = d.width;
if (n.y < 0) {
n.y = 0;
} else if (n.y > d.height) {
n.y = d.height;
n.dx /= 2;
n.dy /= 2;
repaint();
Node pick;
boolean pickfixed;
Image offscreen;
Dimension offscreensize;
Graphics offgraphics;
final Color fixedColor = Color.green;
final Color selectColor = Color.gray;
final Color edgeColor = Color.black;
final Color nodeColor = new Color(200, 90, 50);
final Color showitColor = Color.gray;
final Color arcColor1 = Color.black;
final Color arcColor2 = Color.orange;
final Color arcColor3 = Color.blue;
public void paintNode( Graphics g, Node n, FontMetrics fm) {
int x = (int)n.x;
int y = (int)n.y;
g.setColor((n == pick) ? selectColor : (n.fixed ? fixedColor : nodeColor));
int w = fm.stringWidth(n.lbl) + 10;
int h = fm.getHeight() + 4;
g.fillRect(x - w/2, y - h / 2, w, h);
g.setColor(Color.black);
g.drawRect(x - w/2, y - h / 2, w-1, h-1);
String doit = n.lbl.replace('x','/');
g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());
} // epa
public synchronized void update(Graphics g) {
Dimension d = size();
if ((offscreen == null) || (d.width != offscreensize.width) || (d.height != offscreensize.height)) {
offscreen = createImage(d.width, d.height);
offscreensize = d;
offgraphics = offscreen.getGraphics();
offgraphics.setFont(getFont());
offgraphics.setColor(getBackground());
offgraphics.fillRect(0, 0, d.width, d.height);
for (int i = 0 ; i < nedges ; i++) {
Edge e = edges;
int x1 = (int)nodes[e.from].x;
int y1 = (int)nodes[e.from].y;
int x2 = (int)nodes[e.to].x;
int y2 = (int)nodes[e.to].y;
int len = (int)Math.abs(Math.sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2)) - e.len);
offgraphics.setColor((len < 10) ? arcColor1 : (len < 20 ? arcColor2 : arcColor3)) ;
offgraphics.drawLine(x1, y1, x2, y2);
if (showit) {
String lbl = String.valueOf(len);
offgraphics.setColor(showitColor);
offgraphics.drawString("href= http://localhost:"+lbl, x1 + (x2-x1)/2, y1 + (y2-y1)/2);
offgraphics.setColor(edgeColor);
} //ef5
FontMetrics fm = offgraphics.getFontMetrics();
for (int i = 0 ; i < nnodes ; i++) {
paintNode( offgraphics, nodes, fm); //or
g.drawImage(offscreen, 0, 0, null);
public synchronized boolean mouseDown(Event evt, int x, int y) {
double bestdist = Double.MAX_VALUE;
for (int i = 0 ; i < nnodes ; i++) {
Node n = nodes;
double dist = (n.x - x) * (n.x - x) + (n.y - y) * (n.y - y);
if (dist < bestdist) {
pick = n;
bestdist = dist;
pickfixed = pick.fixed;
pick.fixed = true;
pick.x = x;
pick.y = y;
repaint();
return true;
public synchronized boolean mouseDrag(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
repaint();
return true;
} //e-pubsyncmousedrag
public synchronized boolean mouseUp(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
pick.fixed = pickfixed;
pick = null;
repaint();
return true;
public void start() {
relaxer = new Thread(this);
relaxer.start();
public void stop() {
relaxer.stop();
public class Box extends Applet {
GraphPanel panel;
public void init() {
setLayout(new BorderLayout());
panel = new GraphPanel(this);
add("Center", panel);
Panel p = new Panel();
add("South", p);
p.add(new Button("Reposition"));
p.add(new Button("NewUrl"));
p.add(new Checkbox("Showit"));
String edges = getParameter("edges"); // putinli
for (StringTokenizer t = new StringTokenizer(edges, ",") ; t.hasMoreTokens() ; ) {
String str = t.nextToken();
int i = str.indexOf('-');
if (i > 0) { int len = 50;
int j = str.indexOf('/');
if (j > 0) {
len = Integer.valueOf(str.substring(j+1)).intValue();
str = str.substring(0, j);
panel.addEdge(str.substring(0,i), str.substring(i+1), len);
} //ef8
Dimension d = size();
String center = getParameter("center");
if (center != null){
Node n = panel.nodes[panel.findNode(center)];
n.x = d.width / 2;
n.y = d.height / 2;
n.fixed = true;
} // eif
} // ep
public void start() {
panel.start();
public void stop() {
panel.stop();
public boolean action(Event evt, Object arg) {
if (arg instanceof Boolean) {
if (((Checkbox)evt.target).getLabel().equals("Showit")) {
panel.showit = ((Boolean)arg).booleanValue();
}// e-
else {
panel.random = ((Boolean)arg).booleanValue();
return true;
} // e-if instof bool
if ("Reposition".equals(arg)) {
Dimension d = size();
for (int i = 0 ; i < panel.nnodes ; i++) {
Node n = panel.nodes;
if (!n.fixed) {
n.x = 10 + (d.width-20)*Math.random();
n.y = 10 + (d.height-20)*Math.random();
} //ei
} //ef9
return true;
} //eif scram
if ("NewUrl".equals(arg)) {
Dimension d = size();
URL url = getCodeBase();
try {
getAppletContext().showDocument( new URL(url+"main.htm"), "_blank" );
try {
Thread.sleep(1000);
} catch (InterruptedException e) { }
} catch(MalformedURLException e) {
showStatus("814 URL not found");
for (int i = 0 ; i < panel.nnodes ; i++) {
Node n = panel.nodes;
if (!n.fixed) {
n.x += (80*0.02) - 40;
n.y += (80*0.02) - 40;
return true;
} //ei
return false;
-----------------------htm file to launch------------------------------
<html>
<head>
<title>R
</title>
</head>
<body>
<h3>
<center>
R
</center>
</h3>
I
<b>
</b>
<table border = 1>
<td>De<td>Test List<tr>
<td>N <td><tr>
<td>N <td><tr>
</table>
<b>view </b>
<applet code="Box.class" CODEBASE=. width=1000 height=600
ALT="Test ">
<param name=edges value="http:xxabc.htm-http:xxnet.htm,http:xxthis.htm-http:xx.comet.htm,http:xxnewsighting.htm-http:xxstar.htm,http:xxmoon.htm-http:xxNeptune.htm">
<hr>
</applet>
</b>
<p>
<table border = 1>
<tr>
<tr>
</table>
</html>
</body>
instructions to compile :
0 : The discussion becomes easy to follow after 1st compiling
& viewing the applet.
1. : cut out applet code.
2. : the post somehow deleted all references to "" <--- HERE
see, the data has been deleted again as I preview this post.
( that "" should contain an "i" array increment argument:
"open square bracket" "i" "close square bracket" ) array
so "javac Box.java" will get 10 errors. These "[" "i" "]"
array args must be replaced to compile the code.
3. : All array variables inside the 10 "for" loops ( the bare words
"edges" and "nodes" ) without array increment "i" should
read "edges" "[" "i" "]" & "nodes" "[" "i" "]".
The 10 location lines are approx:
line #65, #129, #136, #149, #195, #283, #311, #331, #477, #522
4. : These 10 edits reqresent a missing "i" to all 10 for loop arrays.
for eddges & nodes. fix this & javac Box.java" will get
4 class files.
5. : cut "Box.htm" from post & do "appletviewer Box.htm"
or put in an apache "htdoc" or tomcat "servlet" http delivered
directory & call "http://localhost/Box.htm.
6. : of course, selecting the event button "NewUrl" will not
work in appletviewer but will work in an http web location.
7. : post your questions to problem or fixes to problem as I'm
monitoring closely. TIA.Thanks for code post tip to fix array deletion problem.
Here is code reposted using delimiters with will
compile straight out of cut/paste.import java.net.MalformedURLException;
import java.net.URL;
import java.net.*;
import java.util.*;
import java.awt.*;
import java.applet.Applet;
import java.applet.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.*;
class Node {
double x;
double y;
double dx;
double dy;
boolean fixed;
String lbl;
class Edge {
int from;
int to;
double len;
} // eEdgeCla
class GraphPanel extends Panel implements Runnable {
Box box;
int nnodes;
Node nodes[] = new Node[100];
int nedges;
Edge edges[] = new Edge[200];
Thread relaxer;
boolean showit;
boolean random;
GraphPanel(Box box) {
this.box = box;
} //ebox
int findNode(String lbl) {
for (int i = 0 ; i < nnodes ; i++) {
//if (nodes.lbl.equals(lbl)) {
if (nodes.lbl.equals(lbl)) {
return i;
return addNode(lbl);
int addNode(String lbl) {
Node n = new Node();
n.x = 10 + 380*Math.random();
n.y = 10 + 380*Math.random();
n.lbl = lbl;
nodes[nnodes] = n;
return nnodes++;
void addEdge(String from, String to, int len) {
Edge e = new Edge();
e.from = findNode(from);
e.to = findNode(to);
e.len = len;
edges[nedges++] = e;
public void run() {
int i3=0;
while (true) {
relax();
if (random && (Math.random() < 0.03)) {
Node n = nodes[(int) (1 * nnodes) ]; // no
if (!n.fixed) {
n.x += (100*0.02) - 50;
n.y += (100*0.02) - 50; //
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
break;
i3++;
} //ew
} // epublrun()
synchronized void relax() {
for (int i = 0 ; i < nedges ; i++) {
//Edge e = edges;
Edge e = edges[i];
double vx = nodes[e.to].x - nodes[e.from].x;
double vy = nodes[e.to].y - nodes[e.from].y;
double len = Math.sqrt(vx * vx + vy * vy);
//double f = (edges.len - len) / (len * 3) ;
double f = (edges[i].len - len) / (len * 3) ;
double dx = f * vx;
double dy = f * vy;
nodes[e.to].dx += dx;
nodes[e.to].dy += dy;
nodes[e.from].dx += -dx;
nodes[e.from].dy += -dy;
} //efo
for (int i = 0 ; i < nnodes ; i++) {
//Node n1 = nodes[i];
Node n1 = nodes[i];
double dx = 0;
double dy = 0;
for (int j = 0 ; j < nnodes ; j++) {
if (i == j) {
continue;
Node n2 = nodes[j];
double vx = n1.x - n2.x;
double vy = n1.y - n2.y;
double len = vx * vx + vy * vy;
if (len == 0) {
dx += 0.02;
dy += 0.02;
} else if (len < 100*100) {
dx += vx / len;
dy += vy / len;
} //ef3a
double dlen = dx * dx + dy * dy;
if (dlen > 0) {
dlen = Math.sqrt(dlen) / 2;
n1.dx += dx / dlen;
n1.dy += dy / dlen;
} //ef3
Dimension d = size();
// f4
for (int i = 0 ; i < nnodes ; i++) {
//Node n = nodes;
Node n = nodes[i];
if (!n.fixed) {
n.x += Math.max(-5, Math.min(5, n.dx));
n.y += Math.max(-5, Math.min(5, n.dy));
if (n.x < 0) {
n.x = 0;
} else if (n.x > d.width) {
n.x = d.width;
if (n.y < 0) {
n.y = 0;
} else if (n.y > d.height) {
n.y = d.height;
n.dx /= 2;
n.dy /= 2;
repaint();
Node pick;
boolean pickfixed;
Image offscreen;
Dimension offscreensize;
Graphics offgraphics;
final Color fixedColor = Color.green;
final Color selectColor = Color.gray;
final Color edgeColor = Color.black;
final Color nodeColor = new Color(200, 90, 50);
final Color showitColor = Color.gray;
final Color arcColor1 = Color.black;
final Color arcColor2 = Color.orange;
final Color arcColor3 = Color.blue;
public void paintNode( Graphics g, Node n, FontMetrics fm) {
int x = (int)n.x;
int y = (int)n.y;
g.setColor((n == pick) ? selectColor : (n.fixed ? fixedColor : nodeColor));
int w = fm.stringWidth(n.lbl) + 10;
int h = fm.getHeight() + 4;
g.fillRect(x - w/2, y - h / 2, w, h);
g.setColor(Color.black);
g.drawRect(x - w/2, y - h / 2, w-1, h-1);
String doit = n.lbl.replace('x','/');
g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());
} // epa
public synchronized void update(Graphics g) {
Dimension d = size();
if ((offscreen == null) || (d.width != offscreensize.width) || (d.height != offscreensize.height)) {
offscreen = createImage(d.width, d.height);
offscreensize = d;
offgraphics = offscreen.getGraphics();
offgraphics.setFont(getFont());
offgraphics.setColor(getBackground());
offgraphics.fillRect(0, 0, d.width, d.height);
for (int i = 0 ; i < nedges ; i++) {
//Edge e = edges;
Edge e = edges[i];
int x1 = (int)nodes[e.from].x;
int y1 = (int)nodes[e.from].y;
int x2 = (int)nodes[e.to].x;
int y2 = (int)nodes[e.to].y;
int len = (int)Math.abs(Math.sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2)) - e.len);
offgraphics.setColor((len < 10) ? arcColor1 : (len < 20 ? arcColor2 : arcColor3)) ;
offgraphics.drawLine(x1, y1, x2, y2);
if (showit) {
String lbl = String.valueOf(len);
offgraphics.setColor(showitColor);
offgraphics.drawString("href= http://localhost:"+lbl, x1 + (x2-x1)/2, y1 + (y2-y1)/2);
offgraphics.setColor(edgeColor);
} //ef5
FontMetrics fm = offgraphics.getFontMetrics();
for (int i = 0 ; i < nnodes ; i++) {
//paintNode( offgraphics, nodes, fm); //or
paintNode( offgraphics, nodes[i], fm); //or
g.drawImage(offscreen, 0, 0, null);
public synchronized boolean mouseDown(Event evt, int x, int y) {
double bestdist = Double.MAX_VALUE;
for (int i = 0 ; i < nnodes ; i++) {
//Node n = nodes;
Node n = nodes[i];
double dist = (n.x - x) * (n.x - x) + (n.y - y) * (n.y - y);
if (dist < bestdist) {
pick = n;
bestdist = dist;
pickfixed = pick.fixed;
pick.fixed = true;
pick.x = x;
pick.y = y;
repaint();
return true;
public synchronized boolean mouseDrag(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
repaint();
return true;
} //e-pubsyncmousedrag
public synchronized boolean mouseUp(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
pick.fixed = pickfixed;
pick = null;
repaint();
return true;
public void start() {
relaxer = new Thread(this);
relaxer.start();
public void stop() {
relaxer.stop();
public class Box extends Applet {
GraphPanel panel;
public void init() {
setLayout(new BorderLayout());
panel = new GraphPanel(this);
add("Center", panel);
Panel p = new Panel();
add("South", p);
p.add(new Button("Reposition"));
p.add(new Button("NewUrl"));
p.add(new Checkbox("Showit"));
String edges = getParameter("edges"); // putinli
for (StringTokenizer t = new StringTokenizer(edges, ",") ; t.hasMoreTokens() ; ) {
String str = t.nextToken();
int i = str.indexOf('-');
if (i > 0) { int len = 50;
int j = str.indexOf('/');
if (j > 0) {
len = Integer.valueOf(str.substring(j+1)).intValue();
str = str.substring(0, j);
panel.addEdge(str.substring(0,i), str.substring(i+1), len);
} //ef8
Dimension d = size();
String center = getParameter("center");
if (center != null){
Node n = panel.nodes[panel.findNode(center)];
n.x = d.width / 2;
n.y = d.height / 2;
n.fixed = true;
} // eif
} // ep
public void start() {
panel.start();
public void stop() {
panel.stop();
public boolean action(Event evt, Object arg) {
if (arg instanceof Boolean) {
if (((Checkbox)evt.target).getLabel().equals("Showit")) {
panel.showit = ((Boolean)arg).booleanValue();
}// e-
else {
panel.random = ((Boolean)arg).booleanValue();
return true;
} // e-if instof bool
if ("Reposition".equals(arg)) {
Dimension d = size();
for (int i = 0 ; i < panel.nnodes ; i++) {
//Node n = panel.nodes;
Node n = panel.nodes[i];
if (!n.fixed) {
n.x = 10 + (d.width-20)*Math.random();
n.y = 10 + (d.height-20)*Math.random();
} //ei
} //ef9
return true;
} //eif scram
if ("NewUrl".equals(arg)) {
Dimension d = size();
URL url = getCodeBase();
try {
getAppletContext().showDocument( new URL(url+"main.htm"), "_blank" );
try {
Thread.sleep(1000);
} catch (InterruptedException e) { }
} catch(MalformedURLException e) {
showStatus("814 URL not found");
for (int i = 0 ; i < panel.nnodes ; i++) {
//Node n = panel.nodes;
Node n = panel.nodes[i];
if (!n.fixed) {
n.x += (80*0.02) - 40;
n.y += (80*0.02) - 40;
return true;
} //ei
return false; -
Floating "boxes" applet with drag events need ckick events
I Have an applet cobbled from the net & modified. Is works but needs one major event added. It draws "Graphics.drawline" boxes with a text "String" inside each box ( the text string represents an URL location). These "boxes" are objects which are "draggable to other locations on canvas & therefore can be independently positioned by user. Each box redraws itself periodically to a slightly different screen location & becomes stationary after a 5 or 6 seconds. The point is, all of this "drag & mobility" behavior must remain intact & is not part of the "problem task".
Task: Need to have an "event" behavior added in one of two ways ( or a 3rd way if there is another ) whichever is quickest/ easiest. "Clickable mouse events" must be added to each box. ( boxes are built in a loop so adding to one will add to other locations & create as many "buttons" as there are boxes) . At each box's location, clicking one box should be an event which fires & clicking a different box should be a separate event which fires. Separate , so that URL location can be "hotlinked" to each box. That URL is currently displayed in the boxes (visible when running applet).
1st possible solution: Exchange these "boxes" which appear on canvas into clickable event "Graph panel.buttons" ( for example or some other clickable object) which maintains existing "drag" behavior of boxes. These buttons must each have "clickability" with mouse events to enable placing "getAppletContext. showDocument()" code with these events ( e.g., "hotlinked" to http locations).
or
2nd possible solution:. The drawstring boxes are currently dead string text with no event model other than the "drag" feature associated with each box. Must add an additional mouse event behavior to existing boxes so they are "clickable" ( or text inside is clickable) and can then execute "showDocument()" URL when clicked independently.
Maybe there is a #3. I don't know what that would be. Open to try anything without losing the drag & placement mobility of existing boxes.
These "boxes" could be images, or event buttons - doesnt matter.
Not sure if #2 is possible & have not been able to accomplish #1. Must stay within existing AWT framework so IE browsers can run it natively ( which of course IE cannot run Swing graphics unless a Sun plugin loaded ).
Applet is a single file ( creating 4 classes).
html file (which invokes it) passes a string param which is broken into above noted URL strings in each box.
Running this applet, you see a "button" event ( at base of canvas labeled "NewUrl" ) which pops up an url location when clicked ( using "showdocument"). This button is not attached to locations or text of each box object ( which is the "task" to accomplish) . The button does represent the kind of event behavior which each "box" should have when task is achieved. So the box can be exchanged with buttons or the boxes can be imbued with events to hyperlink like a button.
In spirit of solution #1, here is the bonehead attempt I tried which did not work: copied entire "if" block of logic from the button event (sited in preceding paragraph) into region of code which builds boxes ( "for" loop of "drawstring" method).
"g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());"
I copied all the "if" block of logic for button creation into the area immediately after the above line ( for loop which builds the boxes). Hoping that I could create buttons with events, along with all the boxes (which are getting created using "drawstring" above in a "for" loop). These "buttons" must also have positioning info of each box to appear in different locations on the canvas. Positioning data is not in that "if" block of code but it would have been a start to get the multiple buttons created ( even if all drawn in one spot). The "if" code block I've provieded for an example begins with the line:
" if ("NewUrl".equals(arg)) { "
and ends with with lines:
" return true; "
" } " //< -- end of above if block
This full "if" block can be seen in the listing below:
This "if" block creates the "NewUrl" button. Of course, I got a bunch of errors when I tried to copy this block to the above location:
variable: "arg" "not found in class GraphPanel".
methods: "getcodebase, showstatus, getappletcontext()"
"not found in class GraphPanel".
----------- The applet code in total follows next
Here are both the java & htm complete source.
import java.net.MalformedURLException;
import java.net.URL;
import java.net.*;
import java.util.*;
import java.awt.*;
import java.applet.Applet;
import java.applet.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.*;
class Node {
double x;
double y;
double dx;
double dy;
boolean fixed;
String lbl;
class Edge {
int from;
int to;
double len;
} // eEdgeCla
class GraphPanel extends Panel implements Runnable {
Box box;
int nnodes;
Node nodes[] = new Node[100];
int nedges;
Edge edges[] = new Edge[200];
Thread relaxer;
boolean showit;
boolean random;
GraphPanel(Box box) {
this.box = box;
} //ebox
int findNode(String lbl) {
for (int i = 0 ; i < nnodes ; i++) {
if (nodes.lbl.equals(lbl)) {
return i;
return addNode(lbl);
int addNode(String lbl) {
Node n = new Node();
n.x = 10 + 380*Math.random();
n.y = 10 + 380*Math.random();
n.lbl = lbl;
nodes[nnodes] = n;
return nnodes++;
void addEdge(String from, String to, int len) {
Edge e = new Edge();
e.from = findNode(from);
e.to = findNode(to);
e.len = len;
edges[nedges++] = e;
public void run() {
int i3=0;
while (true) {
relax();
if (random && (Math.random() < 0.03)) {
Node n = nodes[(int) (1 * nnodes) ]; // no
if (!n.fixed) {
n.x += (100*0.02) - 50;
n.y += (100*0.02) - 50; //
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
break;
i3++;
} //ew
} // epublrun()
synchronized void relax() {
for (int i = 0 ; i < nedges ; i++) {
Edge e = edges;
double vx = nodes[e.to].x - nodes[e.from].x;
double vy = nodes[e.to].y - nodes[e.from].y;
double len = Math.sqrt(vx * vx + vy * vy);
double f = (edges.len - len) / (len * 3) ;
double dx = f * vx;
double dy = f * vy;
nodes[e.to].dx += dx;
nodes[e.to].dy += dy;
nodes[e.from].dx += -dx;
nodes[e.from].dy += -dy;
} //efo
for (int i = 0 ; i < nnodes ; i++) {
Node n1 = nodes;
double dx = 0;
double dy = 0;
for (int j = 0 ; j < nnodes ; j++) {
if (i == j) {
continue;
Node n2 = nodes[j];
double vx = n1.x - n2.x;
double vy = n1.y - n2.y;
double len = vx * vx + vy * vy;
if (len == 0) {
dx += 0.02;
dy += 0.02;
} else if (len < 100*100) {
dx += vx / len;
dy += vy / len;
} //ef3a
double dlen = dx * dx + dy * dy;
if (dlen > 0) {
dlen = Math.sqrt(dlen) / 2;
n1.dx += dx / dlen;
n1.dy += dy / dlen;
} //ef3
Dimension d = size();
// f4
for (int i = 0 ; i < nnodes ; i++) {
Node n = nodes;
if (!n.fixed) {
n.x += Math.max(-5, Math.min(5, n.dx));
n.y += Math.max(-5, Math.min(5, n.dy));
if (n.x < 0) {
n.x = 0;
} else if (n.x > d.width) {
n.x = d.width;
if (n.y < 0) {
n.y = 0;
} else if (n.y > d.height) {
n.y = d.height;
n.dx /= 2;
n.dy /= 2;
repaint();
Node pick;
boolean pickfixed;
Image offscreen;
Dimension offscreensize;
Graphics offgraphics;
final Color fixedColor = Color.green;
final Color selectColor = Color.gray;
final Color edgeColor = Color.black;
final Color nodeColor = new Color(200, 90, 50);
final Color showitColor = Color.gray;
final Color arcColor1 = Color.black;
final Color arcColor2 = Color.orange;
final Color arcColor3 = Color.blue;
public void paintNode( Graphics g, Node n, FontMetrics fm) {
int x = (int)n.x;
int y = (int)n.y;
g.setColor((n == pick) ? selectColor : (n.fixed ? fixedColor : nodeColor));
int w = fm.stringWidth(n.lbl) + 10;
int h = fm.getHeight() + 4;
g.fillRect(x - w/2, y - h / 2, w, h);
g.setColor(Color.black);
g.drawRect(x - w/2, y - h / 2, w-1, h-1);
String doit = n.lbl.replace('x','/');
g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());
} // epa
public synchronized void update(Graphics g) {
Dimension d = size();
if ((offscreen == null) || (d.width != offscreensize.width) || (d.height != offscreensize.height)) {
offscreen = createImage(d.width, d.height);
offscreensize = d;
offgraphics = offscreen.getGraphics();
offgraphics.setFont(getFont());
offgraphics.setColor(getBackground());
offgraphics.fillRect(0, 0, d.width, d.height);
for (int i = 0 ; i < nedges ; i++) {
Edge e = edges;
int x1 = (int)nodes[e.from].x;
int y1 = (int)nodes[e.from].y;
int x2 = (int)nodes[e.to].x;
int y2 = (int)nodes[e.to].y;
int len = (int)Math.abs(Math.sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2)) - e.len);
offgraphics.setColor((len < 10) ? arcColor1 : (len < 20 ? arcColor2 : arcColor3)) ;
offgraphics.drawLine(x1, y1, x2, y2);
if (showit) {
String lbl = String.valueOf(len);
offgraphics.setColor(showitColor);
offgraphics.drawString("href= http://localhost:"+lbl, x1 + (x2-x1)/2, y1 + (y2-y1)/2);
offgraphics.setColor(edgeColor);
} //ef5
FontMetrics fm = offgraphics.getFontMetrics();
for (int i = 0 ; i < nnodes ; i++) {
paintNode( offgraphics, nodes, fm); //or
g.drawImage(offscreen, 0, 0, null);
public synchronized boolean mouseDown(Event evt, int x, int y) {
double bestdist = Double.MAX_VALUE;
for (int i = 0 ; i < nnodes ; i++) {
Node n = nodes;
double dist = (n.x - x) * (n.x - x) + (n.y - y) * (n.y - y);
if (dist < bestdist) {
pick = n;
bestdist = dist;
pickfixed = pick.fixed;
pick.fixed = true;
pick.x = x;
pick.y = y;
repaint();
return true;
public synchronized boolean mouseDrag(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
repaint();
return true;
} //e-pubsyncmousedrag
public synchronized boolean mouseUp(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
pick.fixed = pickfixed;
pick = null;
repaint();
return true;
public void start() {
relaxer = new Thread(this);
relaxer.start();
public void stop() {
relaxer.stop();
public class Box extends Applet {
GraphPanel panel;
public void init() {
setLayout(new BorderLayout());
panel = new GraphPanel(this);
add("Center", panel);
Panel p = new Panel();
add("South", p);
p.add(new Button("Reposition"));
p.add(new Button("NewUrl"));
p.add(new Checkbox("Showit"));
String edges = getParameter("edges"); // putinli
for (StringTokenizer t = new StringTokenizer(edges, ",") ; t.hasMoreTokens() ; ) {
String str = t.nextToken();
int i = str.indexOf('-');
if (i > 0) { int len = 50;
int j = str.indexOf('/');
if (j > 0) {
len = Integer.valueOf(str.substring(j+1)).intValue();
str = str.substring(0, j);
panel.addEdge(str.substring(0,i), str.substring(i+1), len);
} //ef8
Dimension d = size();
String center = getParameter("center");
if (center != null){
Node n = panel.nodes[panel.findNode(center)];
n.x = d.width / 2;
n.y = d.height / 2;
n.fixed = true;
} // eif
} // ep
public void start() {
panel.start();
public void stop() {
panel.stop();
public boolean action(Event evt, Object arg) {
if (arg instanceof Boolean) {
if (((Checkbox)evt.target).getLabel().equals("Showit")) {
panel.showit = ((Boolean)arg).booleanValue();
}// e-
else {
panel.random = ((Boolean)arg).booleanValue();
return true;
} // e-if instof bool
if ("Reposition".equals(arg)) {
Dimension d = size();
for (int i = 0 ; i < panel.nnodes ; i++) {
Node n = panel.nodes;
if (!n.fixed) {
n.x = 10 + (d.width-20)*Math.random();
n.y = 10 + (d.height-20)*Math.random();
} //ei
} //ef9
return true;
} //eif scram
if ("NewUrl".equals(arg)) {
Dimension d = size();
URL url = getCodeBase();
try {
getAppletContext().showDocument( new URL(url+"main.htm"), "_blank" );
try {
Thread.sleep(1000);
} catch (InterruptedException e) { }
} catch(MalformedURLException e) {
showStatus("814 URL not found");
for (int i = 0 ; i < panel.nnodes ; i++) {
Node n = panel.nodes;
if (!n.fixed) {
n.x += (80*0.02) - 40;
n.y += (80*0.02) - 40;
return true;
} //ei
return false;
-----------------------htm file to launch------------------------------
<html>
<head>
<title>R
</title>
</head>
<body>
<h3>
<center>
R
</center>
</h3>
I
<b>
</b>
<table border = 1>
<td>De<td>Test List<tr>
<td>N <td><tr>
<td>N <td><tr>
</table>
<b>view </b>
<applet code="Box.class" CODEBASE=. width=1000 height=600
ALT="Test ">
<param name=edges value="http:xxabc.htm-http:xxnet.htm,http:xxthis.htm-http:xx.comet.htm,http:xxnewsighting.htm-http:xxstar.htm,http:xxmoon.htm-http:xxNeptune.htm">
<hr>
</applet>
</b>
<p>
<table border = 1>
<tr>
<tr>
</table>
</html>
</body>
instructions to compile :
0 : The discussion becomes easy to follow after 1st compiling
& viewing the applet.
1. : cut out applet code.
2. : the post somehow deleted all references to "" <--- HERE
see, the data has been deleted again as I preview this post.
( that "" should contain an "i" array increment argument:
"open square bracket" "i" "close square bracket" ) array
so "javac Box.java" will get 10 errors. These "[" "i" "]"
array args must be replaced to compile the code.
3. : All array variables inside the 10 "for" loops ( the bare words
"edges" and "nodes" ) without array increment "i" should
read "edges" "[" "i" "]" & "nodes" "[" "i" "]".
The 10 location lines are approx:
line #65, #129, #136, #149, #195, #283, #311, #331, #477, #522
4. : These 10 edits reqresent a missing "i" to all 10 for loop arrays.
for eddges & nodes. fix this & javac Box.java" will get
4 class files.
5. : cut "Box.htm" from post & do "appletviewer Box.htm"
or put in an apache "htdoc" or tomcat "servlet" http delivered
directory & call "http://localhost/Box.htm.
6. : of course, selecting the event button "NewUrl" will not
work in appletviewer but will work in an http web location.
7. : post your questions to problem or fixes to problem as I'm
monitoring closely. TIA.Thanks for code post tip to fix array index deletion problem.
Here is code reposted using "code" delimiters which will
compile straight out of cut/paste.
import java.net.MalformedURLException;
import java.net.URL;
import java.net.*;
import java.util.*;
import java.awt.*;
import java.applet.Applet;
import java.applet.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.*;
class Node {
double x;
double y;
double dx;
double dy;
boolean fixed;
String lbl;
class Edge {
int from;
int to;
double len;
} // eEdgeCla
class GraphPanel extends Panel implements Runnable {
Box box;
int nnodes;
Node nodes[] = new Node[100];
int nedges;
Edge edges[] = new Edge[200];
Thread relaxer;
boolean showit;
boolean random;
GraphPanel(Box box) {
this.box = box;
} //ebox
int findNode(String lbl) {
for (int i = 0 ; i < nnodes ; i++) {
//if (nodes.lbl.equals(lbl)) {
if (nodes.lbl.equals(lbl)) {
return i;
return addNode(lbl);
int addNode(String lbl) {
Node n = new Node();
n.x = 10 + 380*Math.random();
n.y = 10 + 380*Math.random();
n.lbl = lbl;
nodes[nnodes] = n;
return nnodes++;
void addEdge(String from, String to, int len) {
Edge e = new Edge();
e.from = findNode(from);
e.to = findNode(to);
e.len = len;
edges[nedges++] = e;
public void run() {
int i3=0;
while (true) {
relax();
if (random && (Math.random() < 0.03)) {
Node n = nodes[(int) (1 * nnodes) ]; // no
if (!n.fixed) {
n.x += (100*0.02) - 50;
n.y += (100*0.02) - 50; //
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
break;
i3++;
} //ew
} // epublrun()
synchronized void relax() {
for (int i = 0 ; i < nedges ; i++) {
//Edge e = edges;
Edge e = edges[i];
double vx = nodes[e.to].x - nodes[e.from].x;
double vy = nodes[e.to].y - nodes[e.from].y;
double len = Math.sqrt(vx * vx + vy * vy);
//double f = (edges.len - len) / (len * 3) ;
double f = (edges[i].len - len) / (len * 3) ;
double dx = f * vx;
double dy = f * vy;
nodes[e.to].dx += dx;
nodes[e.to].dy += dy;
nodes[e.from].dx += -dx;
nodes[e.from].dy += -dy;
} //efo
for (int i = 0 ; i < nnodes ; i++) {
//Node n1 = nodes[i];
Node n1 = nodes[i];
double dx = 0;
double dy = 0;
for (int j = 0 ; j < nnodes ; j++) {
if (i == j) {
continue;
Node n2 = nodes[j];
double vx = n1.x - n2.x;
double vy = n1.y - n2.y;
double len = vx * vx + vy * vy;
if (len == 0) {
dx += 0.02;
dy += 0.02;
} else if (len < 100*100) {
dx += vx / len;
dy += vy / len;
} //ef3a
double dlen = dx * dx + dy * dy;
if (dlen > 0) {
dlen = Math.sqrt(dlen) / 2;
n1.dx += dx / dlen;
n1.dy += dy / dlen;
} //ef3
Dimension d = size();
// f4
for (int i = 0 ; i < nnodes ; i++) {
//Node n = nodes;
Node n = nodes[i];
if (!n.fixed) {
n.x += Math.max(-5, Math.min(5, n.dx));
n.y += Math.max(-5, Math.min(5, n.dy));
if (n.x < 0) {
n.x = 0;
} else if (n.x > d.width) {
n.x = d.width;
if (n.y < 0) {
n.y = 0;
} else if (n.y > d.height) {
n.y = d.height;
n.dx /= 2;
n.dy /= 2;
repaint();
Node pick;
boolean pickfixed;
Image offscreen;
Dimension offscreensize;
Graphics offgraphics;
final Color fixedColor = Color.green;
final Color selectColor = Color.gray;
final Color edgeColor = Color.black;
final Color nodeColor = new Color(200, 90, 50);
final Color showitColor = Color.gray;
final Color arcColor1 = Color.black;
final Color arcColor2 = Color.orange;
final Color arcColor3 = Color.blue;
public void paintNode( Graphics g, Node n, FontMetrics fm) {
int x = (int)n.x;
int y = (int)n.y;
g.setColor((n == pick) ? selectColor : (n.fixed ? fixedColor : nodeColor));
int w = fm.stringWidth(n.lbl) + 10;
int h = fm.getHeight() + 4;
g.fillRect(x - w/2, y - h / 2, w, h);
g.setColor(Color.black);
g.drawRect(x - w/2, y - h / 2, w-1, h-1);
String doit = n.lbl.replace('x','/');
g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());
} // epa
public synchronized void update(Graphics g) {
Dimension d = size();
if ((offscreen == null) || (d.width != offscreensize.width) || (d.height != offscreensize.height)) {
offscreen = createImage(d.width, d.height);
offscreensize = d;
offgraphics = offscreen.getGraphics();
offgraphics.setFont(getFont());
offgraphics.setColor(getBackground());
offgraphics.fillRect(0, 0, d.width, d.height);
for (int i = 0 ; i < nedges ; i++) {
//Edge e = edges;
Edge e = edges[i];
int x1 = (int)nodes[e.from].x;
int y1 = (int)nodes[e.from].y;
int x2 = (int)nodes[e.to].x;
int y2 = (int)nodes[e.to].y;
int len = (int)Math.abs(Math.sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2)) - e.len);
offgraphics.setColor((len < 10) ? arcColor1 : (len < 20 ? arcColor2 : arcColor3)) ;
offgraphics.drawLine(x1, y1, x2, y2);
if (showit) {
String lbl = String.valueOf(len);
offgraphics.setColor(showitColor);
offgraphics.drawString("href= http://localhost:"+lbl, x1 + (x2-x1)/2, y1 + (y2-y1)/2);
offgraphics.setColor(edgeColor);
} //ef5
FontMetrics fm = offgraphics.getFontMetrics();
for (int i = 0 ; i < nnodes ; i++) {
//paintNode( offgraphics, nodes, fm); //or
paintNode( offgraphics, nodes[i], fm); //or
g.drawImage(offscreen, 0, 0, null);
public synchronized boolean mouseDown(Event evt, int x, int y) {
double bestdist = Double.MAX_VALUE;
for (int i = 0 ; i < nnodes ; i++) {
//Node n = nodes;
Node n = nodes[i];
double dist = (n.x - x) * (n.x - x) + (n.y - y) * (n.y - y);
if (dist < bestdist) {
pick = n;
bestdist = dist;
pickfixed = pick.fixed;
pick.fixed = true;
pick.x = x;
pick.y = y;
repaint();
return true;
public synchronized boolean mouseDrag(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
repaint();
return true;
} //e-pubsyncmousedrag
public synchronized boolean mouseUp(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
pick.fixed = pickfixed;
pick = null;
repaint();
return true;
public void start() {
relaxer = new Thread(this);
relaxer.start();
public void stop() {
relaxer.stop();
public class Box extends Applet {
GraphPanel panel;
public void init() {
setLayout(new BorderLayout());
panel = new GraphPanel(this);
add("Center", panel);
Panel p = new Panel();
add("South", p);
p.add(new Button("Reposition"));
p.add(new Button("NewUrl"));
p.add(new Checkbox("Showit"));
String edges = getParameter("edges"); // putinli
for (StringTokenizer t = new StringTokenizer(edges, ",") ; t.hasMoreTokens() ; ) {
String str = t.nextToken();
int i = str.indexOf('-');
if (i > 0) { int len = 50;
int j = str.indexOf('/');
if (j > 0) {
len = Integer.valueOf(str.substring(j+1)).intValue();
str = str.substring(0, j);
panel.addEdge(str.substring(0,i), str.substring(i+1), len);
} //ef8
Dimension d = size();
String center = getParameter("center");
if (center != null){
Node n = panel.nodes[panel.findNode(center)];
n.x = d.width / 2;
n.y = d.height / 2;
n.fixed = true;
} // eif
} // ep
public void start() {
panel.start();
public void stop() {
panel.stop();
public boolean action(Event evt, Object arg) {
if (arg instanceof Boolean) {
if (((Checkbox)evt.target).getLabel().equals("Showit")) {
panel.showit = ((Boolean)arg).booleanValue();
}// e-
else {
panel.random = ((Boolean)arg).booleanValue();
return true;
} // e-if instof bool
if ("Reposition".equals(arg)) {
Dimension d = size();
for (int i = 0 ; i < panel.nnodes ; i++) {
//Node n = panel.nodes;
Node n = panel.nodes[i];
if (!n.fixed) {
n.x = 10 + (d.width-20)*Math.random();
n.y = 10 + (d.height-20)*Math.random();
} //ei
} //ef9
return true;
} //eif scram
if ("NewUrl".equals(arg)) {
Dimension d = size();
URL url = getCodeBase();
try {
getAppletContext().showDocument( new URL(url+"main.htm"), "_blank" );
try {
Thread.sleep(1000);
} catch (InterruptedException e) { }
} catch(MalformedURLException e) {
showStatus("814 URL not found");
for (int i = 0 ; i < panel.nnodes ; i++) {
//Node n = panel.nodes;
Node n = panel.nodes[i];
if (!n.fixed) {
n.x += (80*0.02) - 40;
n.y += (80*0.02) - 40;
return true;
} //ei
return false; -
An applet in a floating frame.
I have this applet that I've put in its own frame so that it isn't embedded in the browser anymore. Is it possible to embed the applet in a new browser window?
Not too sure if I understand what you mean here.....do
you mean open an applet with the appletviewer?
Otherwise I would surely love to know how you manage
to do that.No I mean create a new frame, put all the components in it, and make it visible.
It's definitely possible with the help of JavaScript
-- all you have to do is open a new window and use
document.write to write the applet tag to the newly
opened window. It can even be done from inside of an
applet if the applet has access to the JSObject
class.
V.V.Yeah that's what I tried. The problem is that I don't want to load another instance of my applet. I'd like to put the one that's already running into another browser window. I have a sneaking suspicion that it isn't possible, but I thought I'd ask some advice before giving up. -
Web Cam applet is not working in great consistency
Hi... My video capturing applet is not working very well.
The image stream is displayed on the web page in JPEG format with 0.5 quality. However, it crashes after a while and the it does not release the vfw resource.
I have to restart my machine in order to execute it again.
Can anyone please help?
Thanks.
CarterOk. Thanks.
Sender Applet
import javax.swing.*;
import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
/*<applet code="myGUIApplet.class" width="300" height="300"></applet>*/
public class myGUIApplet extends JApplet implements ActionListener
private JPanel bottom=new JPanel();
private JPanel centVisual=new JPanel();
private JPanel connectionAddress=new JPanel();
private JButton capture=new JButton("Start Capturing");
private JButton stops=new JButton("Stop");
private JMenuBar menubar=new JMenuBar();
private JMenu file=new JMenu("file");
private JMenuItem fileItem1=new JMenuItem("Exit");
private JLabel serverip=new JLabel("Server IP");
private JTextField setIP=new JTextField();
public static JTextField ServerInfo=new JTextField();
private MyTransmitter mytrans;
private String ip;
public static final String DEFAULT_MULTICAST_IP="226.10.10.20";
public static final String DEFAULT_PORT="80";
public void init()
//setSize(400,400);
setLayout(new BorderLayout());
menubar.add(file);
file.add(fileItem1);
bottom.setLayout(new BorderLayout());
bottom.setBackground(Color.black);
bottom.add("West",capture);
bottom.add("East",stops);
connectionAddress.setLayout(new BorderLayout());
connectionAddress.add("North",serverip);
connectionAddress.add("South",setIP);
ServerInfo.setEditable(false);
connectionAddress.add("Center",ServerInfo);
setIP.addActionListener(this);
setIP.setText("");
capture.setBackground(Color.lightGray);
capture.addActionListener(this);
stops.addActionListener(this);
fileItem1.addActionListener(this);
add("South",bottom);
add("North",menubar);
add("Center",connectionAddress);
public void actionPerformed(ActionEvent ae){
Object source=ae.getSource();
if(source==capture){
if(setIP.getText().equals(""))
ip=DEFAULT_MULTICAST_IP;
else{
ip=setIP.getText();
if(mytrans!=null){
mytrans.stopTransmitter();
mytrans=null;
System.out.println(" - Connecting to "+ip+" port: "+DEFAULT_PORT);
ServerInfo.setText(" - Connecting to "+ip+" port: "+DEFAULT_PORT);
mytrans=new MyTransmitter(ip,DEFAULT_PORT,ServerInfo);
mytrans.start();
if(source==stops){
if(mytrans!=null)
mytrans.stopTransmitter();
System.exit(0);
if(source==fileItem1){
if(mytrans!=null)
mytrans.stopTransmitter();
System.exit(0);
public void destroy(){
if(mytrans!=null){
mytrans.stopTransmitter();
import java.awt.*;
import javax.swing.*;
import java.io.*;
import java.util.*;
import java.net.InetAddress;
import javax.media.*;
import javax.media.protocol.*;
import javax.media.protocol.DataSource;
import javax.media.format.*;
import javax.media.control.TrackControl;
import javax.media.control.QualityControl;
import javax.media.rtp.*;
import javax.media.rtp.rtcp.*;
import javax.media.rtp.*;
import java.io.InputStream;
import javax.media.rtp.RTPManager;
public class MyTransmitter extends Thread
private MediaLocator videoLocator;
private String ipAddress;
private int basePort;
private Integer stateLock=new Integer(0);
private boolean failure;
private Processor processor;
private DataSource videoDataInput,videoDataOutput;
private RTPManager rtpMgrs[];
private VideoFormat JPEG_VIDEO=new VideoFormat(VideoFormat.JPEG_RTP);
private SendStream sendStream;
private SourceDescription descriptionList[];
private JTextField infoField;
public MyTransmitter(String ips,String ports,JTextField ServerInfo){
infoField=ServerInfo;
ipAddress=ips;
Integer bPort=Integer.valueOf(ports);
if(bPort!=null)
basePort=bPort.intValue();
public void run()
initializeVideo();
if(videoLocator!=null){
createMyProcessor();
createMyManager();
// May be should put inside the if..else statements
//createMyTransmitter();
// Initailize the video
public void initializeVideo()
// Stre the devices in a vector
VideoFormat format=new VideoFormat(VideoFormat.RGB);
Vector deviceList=CaptureDeviceManager.getDeviceList(format);
CaptureDeviceInfo deviceInfo=null;
// If there is more than one device detected
if(deviceList.size()>0){
// Set the first device to device Info
// GEt the media locator of the devie
deviceInfo=(CaptureDeviceInfo)deviceList.elementAt(0);
videoLocator=deviceInfo.getLocator();
}else{
System.out.println(" --X No device found...");
infoField.setText(" --X No device found...");
public void createMyProcessor()
boolean result=false;
DataSource ds=null;
// Check if the media locator is null
if(videoLocator==null){
System.out.println(" --X No video locator..");
infoField.setText(" --X No video locator...");
System.out.println(" - Trying to create a Processor..");
infoField.setText(" - Trying to create a Processor..");
// Attempt to create DataSource from media locator
try{
ds=Manager.createDataSource(videoLocator);
}catch(Exception ex){
System.out.println(" --X Unable to create dataSource : "+ex.getMessage());
System.out.println(" - Video data source is created..");
infoField.setText(" - Video data source is created..");
// Try to create Processor from DataSource
try{
processor=Manager.createProcessor(ds);
}catch(NoProcessorException npe){
System.out.println(" --X Unable to create Processor: "+npe.getMessage());
infoField.setText(" --X Unable to create Processor: "+npe.getMessage());
catch(IOException ioe){
System.out.println(" --X IOException creating Processor..");
infoField.setText(" --X IOException creating Processor..");
// Wait for the processor to be configured
result=waitForState(processor,Processor.Configured);
if(result==false){
System.out.println(" --X Could not configure processor..");
infoField.setText(" --X Could not configure processor..");
// Set the track controls for processor
TrackControl []tracks=processor.getTrackControls();
if(tracks==null || tracks.length<1){
System.err.println(" --X No track is found..");
infoField.setText(" --X No track is found..");
// Set the content description of processor to RAW_RTP format
// This will limit the supported formats to reported from
// Track.getSupportedFormats() to valid RTP format
ContentDescriptor cdes=new ContentDescriptor(ContentDescriptor.RAW_RTP);
processor.setContentDescriptor(cdes);
Format []supported;
Format chosen=null;
boolean atLeastOneTrack=false;
for(int i=0;i<tracks.length;i++){
Format format=tracks.getFormat();
if(tracks[i].isEnabled()){
supported=tracks[i].getSupportedFormats();
// WE've set the output content to RAW_RTP.
// So, all the supporte formats should work with RAW_RTP.
// We will pick the first one.
if(supported.length>0){
if(supported[0] instanceof VideoFormat){
chosen=checkVideoSize(tracks[i].getFormat(),supported[0]);
}else
chosen=supported[0];
tracks[i].setFormat(chosen);
System.out.println(" Track "+i+" is transmitted in "+chosen+" format.. ");
infoField.setText(" Track "+i+" is transmitted in "+chosen+" format.. ");
atLeastOneTrack=true;
}else{
// If no format is suitable, track is disabled
tracks[i].setEnabled(false);
}else
tracks[i].setEnabled(false);
if(!atLeastOneTrack)
System.out.println("atLeastOneTrack: "+atLeastOneTrack);
System.out.println(" --X Could Not find track to RTP format..");
infoField.setText("atLeastOneTrack: "+atLeastOneTrack);
infoField.setText(" --X Could Not find track to RTP format..");
result=waitForState(processor,Controller.Realized);
if(result==false){
System.out.println(" --X Could NOT realize processor...");
infoField.setText(" --X Could NOT realize processor...");
// Set the JPEG Quality to value 0.5
setJPEGQuality(processor,0.5f);
// Set the output Data Source
videoDataOutput=processor.getDataOutput();
//Start the processor
processor.start();
public void setJPEGQuality(Processor p,float values)
Control []cs=p.getControls();
QualityControl qc=null;
VideoFormat JPEGFmt=new VideoFormat(VideoFormat.JPEG);
// Loop through the ocntrols to find the Quality control for the JPEG encoder
for(int i=0;i<cs.length;i++){
if(cs[i] instanceof QualityControl && cs[i] instanceof Owned){
Object owner=((Owned)cs[i]).getOwner();
// Check if the owner is the Codec
// Check the format of output as well
if(owner instanceof Codec){
Format fmts[]=((Codec)owner).getSupportedOutputFormats(null);
// Loop through the supported format and set the quality to 0.5
for(int j=0;j<fmts.length;j++){
qc=(QualityControl)cs[i];
qc.setQuality(values);
System.out.println(" - Quality is set to "+values+" on "+qc);
infoField.setText(" - Quality is set to "+values+" on "+qc);
break;
if(qc!=null)
break;
public Format checkVideoSize(Format originalFormat,Format supported)
int width,height;
Dimension size=((VideoFormat)originalFormat).getSize();
Format jpegFormat=new Format(VideoFormat.JPEG_RTP);
Format h263fmt=new Format(VideoFormat.H263_RTP);
if(supported.matches(jpegFormat)){
width=(size.width%8 == 0 ? size.width:(int)(size.width%8)*8);
height=(size.height%8 == 0 ? size.height:(int)(size.height%8)*8);
}else if(supported.matches(h263fmt)){
if(size.width<128){
width=128;
height=96;
}else if(size.width<176){
width=176;
height=144;
}else{
width=352;
height=288;
}else{
// Unknown format, just return it.
return supported;
return (new VideoFormat(null,new Dimension(width,height),Format.NOT_SPECIFIED,null,Format.NOT_SPECIFIED)).intersects(supported);
public boolean waitForState(Processor p,Integer status)
p.addControllerListener(new StateListener());
failure=false;
if(status==Processor.Configured){
p.configure();
}else if(status==Processor.Realized){
p.realize();
//Wait until an event that confirms the success of the method, or failure of an event
while(p.getState()<status && !failure){
synchronized(getStateLock()){
try{
// Wait
getStateLock().wait();
}catch(InterruptedException ie){
return false;
if(failure)
return false;
else
return true;
public Integer getStateLock(){
return stateLock;
public void setFailure(){
failure=true;
public void createMyManager()
SessionAddress destAddress;
InetAddress ipAddr;
int port;
SourceDescription srcDesList[];
PushBufferDataSource pbds=(PushBufferDataSource)videoDataOutput;
PushBufferStream pbss[]=pbds.getStreams();
rtpMgrs=new RTPManager[pbss.length];
for(int a=0;a<pbss.length;a++){
try{
// RTP Managers or RTP Manager?????
rtpMgrs[a]=RTPManager.newInstance();
port=basePort;
ipAddr=InetAddress.getByName(ipAddress);
SessionAddress localAddr=new SessionAddress(InetAddress.getLocalHost(),port+20);
destAddress=new SessionAddress(ipAddr,port,1);
Integer myipprefix=Integer.valueOf(ipAddress.substring(0,3));
if((myipprefix.intValue()>223) && (myipprefix.intValue()<240)){
rtpMgrs[a].initialize(destAddress);
}else{
rtpMgrs[a].initialize(localAddr);
rtpMgrs[a].addTarget(destAddress);
System.out.println(" Created RTP session: "+ipAddress+" "+port+" to "+destAddress);
infoField.setText(" Created RTP session: "+ipAddress+" "+port+" to "+destAddress);
if(videoDataOutput!=null){
sendStream=rtpMgrs[a].createSendStream(videoDataOutput,0);
sendStream.start();
System.out.println(" RTP stream is started..");
infoField.setText(" RTP stream is started..");
}catch(UnsupportedFormatException ex){
System.out.println(" --X Unsupported Format : "+ex);
infoField.setText(" --X Unsupported Format : "+ex);
catch(IOException ioe){
System.out.println(" --X IOException : "+ioe.getMessage());
infoField.setText(" --X IOException : "+ioe.getMessage());
catch(Exception ex){
System.out.println(" --X Unable to create RTP Manager...");
System.out.println(ex.getMessage());
infoField.setText(" --X Unable to create RTP Manager..."+ex.getMessage());
/*public void createMyTransmitter()
try{
if(videoDataOutput!=null){
sendStream=rtpMgrs[i].createSendStream(videoDataOutput,0);
sendStream.start();
}catch(UnsupportedFormatException ex){
System.out.println(" --X Unsupported Format : "+ex);
infoField.setText(" --X Unsupported Format : "+ex);
catch(IOException ioe){
System.out.println(" --X IOException : "+ioe.getMessage());
infoField.setText(" --X IOException : "+ioe.getMessage());
public void stopTransmitter(){
if(processor!=null){
processor.stop();
processor.close();
processor=null;
// Loop through RTP Managers and close all managers..
// Dispose them for garbage collection
for(int i=0;i<rtpMgrs.length;i++){
rtpmgrs[i].removeSendStream(this);
rtpMgrs[i].removeTargets("Session ended..");
rtpMgrs[i].dispose();
//rtpMgrs.removeTargets("Session ended..");
//rtpMgrs.dispose();
* StateListener class to handle Controller events
class StateListener implements ControllerListener{
public void controllerUpdate(ControllerEvent ce){
if(ce instanceof ControllerClosedEvent){
processor.close();
/* Handle all controller events and notify all
waiting thread in waitForState method */
if(ce instanceof ControllerEvent){
synchronized(getStateLock()){
getStateLock().notifyAll();
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Client Applet
import javax.media.*;
import javax.media.protocol.*;
import javax.media.protocol.DataSource;
import javax.media.control.BufferControl;
import javax.media.control.*;
import javax.media.format.*;
import javax.media.rtp.*;
import javax.media.rtp.rtcp.*;
import javax.media.rtp.event.*;
import com.sun.media.rtp.RTPSessionMgr;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.io.*;
import java.net.*;
import java.net.URL;
import java.net.Socket;
/*<applet code="clientPlayerApplet.class" width="400" height="300">
<param name=ServerIPS value="192.168.0.9">
<param name=ServerPort value="80">
<param name=TimeToLive value="1">
<param name=archive value="clientPlayerApplet.jar">
</applet> */
public class clientPlayerApplet extends JApplet implements ControllerListener, ReceiveStreamListener,SessionListener
String sessions[]=null;
RTPManager rtpmgrs[]=null;
boolean dataReceived=false;
Object myDataSync=new Object();
private Player player;
//private String serveripadd="226.10.10.20";
//private int serverPort=2020;
//private int timeToLive=1;
private JPanel panel;
private Vector currentParticipant;
public void init()
panel=new JPanel();
setLayout(new BorderLayout());
add("Center",panel);
//String[] urls;
/*urls[0]=getParameter("ServerIPS");
urls[1]="/";
urls[2]=getParameter("ServerPort");*/
String []urls={new String(getParameter("ServerIPS")+"/"+getParameter("ServerPort")+"/"+getParameter("TimeToLive"))};
sessions=urls;
initializePlayer();
public void initializePlayer(){
try{
InetAddress ipAddr;
SessionAddress localAddr=new SessionAddress();
SessionAddress destAddr;
rtpmgrs=new RTPManager[sessions.length];
currentParticipant=new Vector();
//rtpmgrs=new RTPManager();
SessionLabel session=null;
//Open RTP session
for(int i=0;i<sessions.length;i++){
try{
session=new SessionLabel(sessions[i]);
//session=new SessionLabel(sessions);
}catch(IllegalArgumentException iae){
System.out.println(" --X Unable to parse the sesion address given");
System.out.println(" - Open RTP session for "+session.port);
rtpmgrs[i]=(RTPManager) RTPManager.newInstance();
rtpmgrs[i].addSessionListener(this);
rtpmgrs[i].addReceiveStreamListener(this);
ipAddr=InetAddress.getByName(session.addr);
if(ipAddr.isMulticastAddress()){
localAddr=new SessionAddress(ipAddr,session.port,session.ttl);
destAddr=new SessionAddress(ipAddr,session.port,session.ttl);
}else{
localAddr=new SessionAddress(InetAddress.getLocalHost(),session.port);
destAddr=new SessionAddress(ipAddr,session.port);
rtpmgrs[i].initialize(localAddr);
BufferControl bc=(BufferControl)rtpmgrs[i].getControl("javax.media.control.BufferControl");
if(bc!=null)
bc.setBufferLength(600);
rtpmgrs[i].addTarget(destAddr);
}catch(Exception ex){
System.out.println(" --X Cannot create RTP Session "+ex.getMessage());
long currentTime=System.currentTimeMillis();
long waitingDuration=10000;
try{
synchronized(myDataSync){
while(!dataReceived && (System.currentTimeMillis() - currentTime < waitingDuration)){
if(!dataReceived){
myDataSync.wait(1000);
}catch(Exception ex){
System.out.println(" --X myDataSync interrupted...");
if(!dataReceived){
System.out.println(" No RTP Stream Data is received.." );
public void destroy()
for(int i=0;i<currentParticipant.size();i++){
//if(player!=null)
((MyPlayList)currentParticipant.elementAt(i)).close();
// Loop through the RTP Managers
// -> Remove the stream listener
// -> Remove the target address
// -> Dispose the RTP Manager for garbage collection
currentParticipant.removeAllElements();
for(int i=0;i<rtpmgrs.length;i++){
if(rtpmgrs[i]!=null){
rtpmgrs[i].removeReceiveStreamListener(this);
rtpmgrs[i].removeTargets(" Closing session..");
rtpmgrs[i].dispose();
rtpmgrs[i]=null;
MyPlayList find(Player pl){
for(int i=0;i<currentParticipant.size();i++){
MyPlayList mpl=(MyPlayList)currentParticipant.elementAt(i);
if(mpl.clientPlay==pl)
return mpl;
return null;
MyPlayList find(ReceiveStream rs){
for(int i=0;i<currentParticipant.size();i++){
MyPlayList mpl=(MyPlayList)currentParticipant.elementAt(i);
if(mpl.stream==rs)
return mpl;
return null;
* ReceiveStream Listener function *
public synchronized void update(ReceiveStreamEvent rse)
RTPManager mgr=(RTPManager)rse.getSource();
ReceiveStream stream=rse.getReceiveStream();
Participant participant=rse.getParticipant();
if(rse instanceof RemotePayloadChangeEvent){
System.out.println(" -- Received Payload Change Event..");
System.out.println(" Sorry, no payload change is allowed.");
}else if(rse instanceof NewReceiveStreamEvent){
try{
// Once the new stream is detected, create the datasource
stream=((NewReceiveStreamEvent)rse).getReceiveStream();
DataSource outputDS=stream.getDataSource();
// Get RTP Controller to find the format
RTPControl rtpctl=(RTPControl)outputDS.getControl("javax.media.rtp.RTPControl");
if(rtpctl!=null){
System.out.println(" -> Received new rtP stream: "+rtpctl.getFormat());
}else
System.out.println(" -> Received new RTP stream");
if(participant!=null){
System.out.println(" -> New stream received from: "+participant.getCNAME());
}else{
System.out.println(" -> New stream detected... ");
player=Manager.createPlayer(outputDS);
if(player==null)
return;
System.out.println(" - Player is created...");
player.addControllerListener(this);
player.realize();
// Helper class to identify the player and stream
MyPlayList mpl=new MyPlayList(player,stream);
// Add the helper class object to Vector
currentParticipant.addElement(mpl);
// Notify initializePlayer() that a new stream has arrived
synchronized(myDataSync){
dataReceived=true;
myDataSync.notifyAll();
}catch(Exception ex){
System.out.println(" --X NewReceiveStream Exception: "+ex.getMessage());
return;
}else if(rse instanceof ByeEvent){
System.out.println(" - BYE packet received from "+participant.getCNAME());
MyPlayList mpls=find(stream);
if(player!=mpls){
mpls.close();
currentParticipant.removeElement(mpls);
if(mgr!=null){
mgr.removeReceiveStreamListener(this);
mgr.removeTargets(" Closing session..");
mgr.dispose();
mgr=null;
}else if(rse instanceof StreamMappedEvent){
if(stream!=null && stream.getDataSource()!=null){
DataSource myds=stream.getDataSource();
RTPControl rtpctrl=(RTPControl)myds.getControl("javax.media.rtp.RTPControl");
System.out.println(" -> The previously unidentified stream ");
if(rtpctrl!=null)
System.out.println(" "+rtpctrl.getFormat());
System.out.println(" has been identified as sent by :"+participant.getCNAME());
* Session Listener
public void update(SessionEvent sesevt)
if(sesevt instanceof NewParticipantEvent){
Participant part=((NewParticipantEvent)sesevt).getParticipant();
System.out.println(" -> A new partcipant has joined :"+part.getCNAME());
* ControllerListener for Players
public synchronized void controllerUpdate(ControllerEvent ce)
Player p=(Player)ce.getSource();
if(p==null)
return;
if(ce instanceof RealizeCompleteEvent){
MyPlayList mpls=find(p);
if(mpls!=null){
p.start();
if(p.getVisualComponent()!=null){
panel.add(player.getVisualComponent());
panel.validate();
if(ce instanceof ControllerErrorEvent){
p.removeControllerListener(this);
MyPlayList mpls=find(p);
if(mpls!=null){
// Close the player
// Remove the player helper class object from the list
p.close();
currentParticipant.removeElement(mpls);
System.out.println("Receiver internal error: "+ce);
class SessionLabel{
public String addr=null;
public int port;
public int ttl;
SessionLabel(String session) throws IllegalArgumentException
int off;
String portStr=null;
String ttlStr=null;
if(session!=null && session.length() >0){
while(session.length()>1 && session.charAt(0)=='/')
session=session.substring(1);
off=session.indexOf('/');
if(off==-1){
if(!session.equals(""))
addr=session;
}else{
addr=session.substring(0,off);
session=session.substring(off+1);
off=session.indexOf('/');
if(off==-1){
if(!session.equals(""))
portStr=session;
}else{
portStr=session.substring(0,off);
session=session.substring(off+1);
off=session.indexOf('/');
if(off==-1){
if(!session.equals(""))
ttlStr=session;
}else{
ttlStr=session.substring(0,off);
if(addr==null)
throw new IllegalArgumentException();
if(portStr!=null)
try{
Integer ints=Integer.valueOf(portStr);
if(ints!=null)
port=ints.intValue();
}catch(Throwable t){
System.out.println(" --X PortStr Error..");
throw new IllegalArgumentException();
}else
throw new IllegalArgumentException();
if(ttlStr!=null){
try{
Integer intsttl=Integer.valueOf(ttlStr);
if(intsttl!=null)
ttl=intsttl.intValue();
}catch(Throwable t){
System.out.println(" --X PortStr Error..");
throw new IllegalArgumentException();
class MyPlayList{
Player clientPlay;
ReceiveStream stream;
MyPlayList(Player p,ReceiveStream rs){
clientPlay=p;
stream=rs;
public void close()
clientPlay.close(); -
Loading an image into an Applet from a JAR file
Hello everyone, hopefully a simple question for someone to help me with!
Im trying to load some images into an applet, currently it uses the JApplet.getImage(url) method just before registering with a media tracker, which works but for the sake of efficiency I would prefer the images all to be contained in the jar file as oppossed to being loaded individually from the server.
Say I have a class in a package eg, 'com.mydomain.myapplet.class.bin' and an images contained in the file structure 'com.mydomain.myapplet.images.img.gif' how do I load it (and waiting for it to be loaded before preceeding?
I've seen lots of info of the web for this but much of it is very old (pre 2000) and im sure things have changed a little since then.
Thanks for any help!I don't touch applets, so I can't help you there, but here's some Friday Fun: tracking image loading.
import java.awt.*;
import java.awt.image.*;
import java.beans.*;
import java.io.*;
import java.net.*;
import javax.imageio.*;
import javax.imageio.event.*;
import javax.imageio.stream.*;
import javax.swing.*;
public class ImageLoader extends SwingWorker<BufferedImage, Void> {
private URL url;
private JLabel target;
private IIOReadProgressAdapter listener = new IIOReadProgressAdapter() {
@Override public void imageProgress(ImageReader source, float percentageDone) {
setProgress((int)percentageDone);
@Override public void imageComplete(ImageReader source) {
setProgress(100);
public ImageLoader(URL url, JLabel target) {
this.url = url;
this.target = target;
@Override protected BufferedImage doInBackground() throws IOException {
ImageInputStream input = ImageIO.createImageInputStream(url.openStream());
try {
ImageReader reader = ImageIO.getImageReaders(input).next();
reader.addIIOReadProgressListener(listener);
reader.setInput(input);
return reader.read(0);
} finally {
input.close();
@Override protected void done() {
try {
target.setIcon(new ImageIcon(get()));
} catch(Exception e) {
JOptionPane.showMessageDialog(null, e, "Error", JOptionPane.ERROR_MESSAGE);
//demo
public static void main(String[] args) throws IOException {
final URL url = new URL("http://blogs.sun.com/jag/resource/JagHeadshot.jpg");
EventQueue.invokeLater(new Runnable(){
public void run() {
launch(url);
static void launch(URL url) {
JLabel imageLabel = new JLabel();
final JProgressBar progress = new JProgressBar();
progress.setBorderPainted(true);
progress.setStringPainted(true);
JScrollPane scroller = new JScrollPane(imageLabel);
scroller.setPreferredSize(new Dimension(800,600));
JPanel content = new JPanel(new BorderLayout());
content.add(scroller, BorderLayout.CENTER);
content.add(progress, BorderLayout.SOUTH);
JFrame f = new JFrame("ImageLoader");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setContentPane(content);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
ImageLoader loader = new ImageLoader(url, imageLabel);
loader.addPropertyChangeListener( new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
if ("progress".equals(evt.getPropertyName())) {
progress.setValue((Integer)evt.getNewValue());
System.out.println(evt.getNewValue());
} else if ("state".equals(evt.getPropertyName())) {
if (SwingWorker.StateValue.DONE == evt.getNewValue()) {
progress.setIndeterminate(true);
loader.execute();
abstract class IIOReadProgressAdapter implements IIOReadProgressListener {
@Override public void imageComplete(ImageReader source) {}
@Override public void imageProgress(ImageReader source, float percentageDone) {}
@Override public void imageStarted(ImageReader source, int imageIndex) {}
@Override public void readAborted(ImageReader source) {}
@Override public void sequenceComplete(ImageReader source) {}
@Override public void sequenceStarted(ImageReader source, int minIndex) {}
@Override public void thumbnailComplete(ImageReader source) {}
@Override public void thumbnailProgress(ImageReader source, float percentageDone) {}
@Override public void thumbnailStarted(ImageReader source, int imageIndex, int thumbnailIndex) {}
} -
Can you write to files with an applet or what?
Hi I can't get the bufferwriter to output any text to a file. Not sure if this is because I'm using an applet? I wouldn't assume so, but any help would be appreciated
The problem area is :
private boolean registerNewUser()
FileOutputStream writer;
try
BufferedWriter out = new BufferedWriter(new FileWriter("logins.txt"));
out.write(regUserField.getText());
char [] tempPass = regPasswordField.getPassword();
String tempString = tempPass.toString();
out.write("\n" + tempString);
out.close();
catch(IOException e)
System.out.println("Writing file error.");
System.exit(0);
int intSS = Integer.parseInt(regSSNField.getText());
currentUserAccount = new Account(regNameField.getText(), intSS);
return true;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.*;
import javax.swing.*;
import javax.swing.Icon;
import javax.swing.JApplet;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import java.lang.*;
import java.io.*;
import java.util.*;
public class JBank extends JApplet implements ActionListener
private static double totalMoney = 0;
private static final String BANK_MENUITEM = "Bank";
private static final String NEW_ACCT_MENUITEM = "New Account";
private static final String OPEN_ACCT_MENUITEM = "Open Account";
private static final String DELETE_ACCT_MENUITEM = "Delete Account";
private static final String TRANSFER_ACCT_MENUITEM = "Account transfer";
private static final String WITHDRAW_ACCT_MENUITEM = "Withdraw Funds";
private static final String DEPOSIT_ACCT_MENUITEM = "Deposit Funds";
private static final String OVERVIEW_ACCT_MENUITEM = "Overview of Accounts";
private static final String CHECKING_RADIO_BUTTON = "new account checking";
private static final String SAVINGS_RADIO_BUTTON = "new account savings";
private static final String RETIREMENT_RADIO_BUTTON = "new account retirement";
private static final String LOGIN_BUTTON = "login";
private static final String REGISTER_BUTTON = "register";
private static final String CANCEL_BUTTON = "cancel";
private static final String NEW_ACCT_OK_BUTTON = "new account ok";
private static final String NEW_ACCT_CANCEL_BUTTON = "new account cancel";
private static final String NEW_USER_REGISTER_BUTTON = "new user registration";
private static final String MAIN_TITLE_TEXT = "JBank - A Comp 285 Project";
private Container contentPane = getContentPane();
private JFrame loginFrame = new JFrame();
private JFrame registrationFrame = new JFrame();
private JFrame newAccountFrame = new JFrame();
private JLabel title;
private JTextField loginField;
private JPasswordField passwordField;
private JTextField regNameField;
private JTextField regSSNField;
private JTextField regUserField;
private JTextField initialMoneyField;
private JPasswordField regPasswordField;
boolean trueUser = false;
boolean savingsSelected = false;
boolean checkingSelected = false;
boolean retirementSelected = false;
Account currentUserAccount;
public void init()
//Login First
loginFrame();
contentPane.setLayout(new BorderLayout());
// background color: lightblue
float red = 0f;
float blue = .3f;
float green = .2f; // Java sees double, must specify a suffix of f to
float alpha = .05f; //create float since
Color lightBlue = new Color(red, green, blue, alpha); //<-- constructor requires floats
contentPane.setBackground(lightBlue);
// Menu
JMenuBar jBar = new JMenuBar();
JMenu bankMenu = new JMenu(BANK_MENUITEM);
JMenuItem b;
b = new JMenuItem(NEW_ACCT_MENUITEM);
b.addActionListener(this);
bankMenu.add(b);
b = new JMenuItem(OPEN_ACCT_MENUITEM);
b.addActionListener(this);
bankMenu.add(b);
b = new JMenuItem(DELETE_ACCT_MENUITEM);
b.addActionListener(this);
bankMenu.add(b);
b = new JMenuItem(TRANSFER_ACCT_MENUITEM);
b.addActionListener(this);
bankMenu.add(b);
b = new JMenuItem(OVERVIEW_ACCT_MENUITEM);
b.addActionListener(this);
bankMenu.add(b);
jBar.add(bankMenu);
setJMenuBar(jBar);
// Title JBankset
title = new JLabel(MAIN_TITLE_TEXT);
contentPane.add(title);
public void actionPerformed(ActionEvent arg0)
String command = arg0.getActionCommand();
if (command.equals(BANK_MENUITEM))
title.setText(MAIN_TITLE_TEXT + " " +
BANK_MENUITEM);
else if (command.equals(NEW_ACCT_MENUITEM))
title.setText(MAIN_TITLE_TEXT + " " +
NEW_ACCT_MENUITEM);
newAccountFrame();
else if (command.equals(OPEN_ACCT_MENUITEM))
title.setText(MAIN_TITLE_TEXT + " " +
OPEN_ACCT_MENUITEM);
else if (command.equals(DELETE_ACCT_MENUITEM))
title.setText(MAIN_TITLE_TEXT + " " +
DELETE_ACCT_MENUITEM);
else if (command.equals(TRANSFER_ACCT_MENUITEM))
title.setText(MAIN_TITLE_TEXT + " " +
TRANSFER_ACCT_MENUITEM);
else if (command.equals(OVERVIEW_ACCT_MENUITEM))
title.setText(MAIN_TITLE_TEXT + " " +
OVERVIEW_ACCT_MENUITEM);
else if (command.equals(LOGIN_BUTTON))
Scanner loginFile = null;
String currentFileLoginName;
String triedLogin = loginField.getText();
try
loginFile = new Scanner(new FileInputStream("logins.txt"));
catch(FileNotFoundException e)
System.out.println("Internal Error");
System.exit(0);
do
currentFileLoginName = loginFile.nextLine();
if (processLogin(currentFileLoginName, triedLogin, loginFile)) //Send Logins&File | Return boolean
loginFile.close(); //Close File
break; //Login true. Break out of while loop
while (loginFile.hasNextLine() == true);
else if (command.equals(REGISTER_BUTTON))
registrationFrame();
else if (command.equals(NEW_USER_REGISTER_BUTTON))
registrationFrame.setVisible(false);
if (checkFields() == false)
registrationFrame.dispose();
registrationFrame();
else
registerNewUser();
else if (command.equals(CHECKING_RADIO_BUTTON))
savingsSelected = false;
checkingSelected = true;
retirementSelected = false;
else if (command.equals(SAVINGS_RADIO_BUTTON))
savingsSelected = true;
checkingSelected = false;
retirementSelected = false;
else if(command.equals(RETIREMENT_RADIO_BUTTON))
savingsSelected = false;
checkingSelected = false;
retirementSelected = true;
else if (command.equals(NEW_ACCT_OK_BUTTON))
double doubleInitialMoney = Double.parseDouble(initialMoneyField.getText());
if (savingsSelected)
currentUserAccount.registerAccount("savings");
currentUserAccount.deposit("savings", doubleInitialMoney);
if (checkingSelected)
currentUserAccount.registerAccount("checking");
currentUserAccount.deposit("checking", doubleInitialMoney);
if (retirementSelected)
currentUserAccount.registerAccount("register");
currentUserAccount.deposit("retirement", doubleInitialMoney);
newAccountFrame.dispose();
private void loginFrame()
loginFrame.setTitle("JBank -- Login Required");
loginFrame.setDefaultLookAndFeelDecorated(true);
loginFrame.setBounds(400,350,225,130);
JTextField login = new JTextField("User ID");
JTextField password = new JTextField("Password");
loginFrame.setLayout(new GridLayout(0,2));
//Button Panel
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(4,0));
JLabel space = new JLabel(" ");
JButton okButton = new JButton("Login");
okButton.isDefaultButton();
okButton.setVerticalTextPosition(AbstractButton.CENTER);
JButton register = new JButton("Register");
register.setVerticalTextPosition(AbstractButton.CENTER);
okButton.setActionCommand(LOGIN_BUTTON);
register.setActionCommand(REGISTER_BUTTON);
okButton.addActionListener(this);
register.addActionListener(this);
buttonPanel.add(okButton);
buttonPanel.add(space);
buttonPanel.add(register);
buttonPanel.add(space);
//Text Panel
JPanel textPanel = new JPanel();
textPanel.setLayout(new GridLayout(4,0));
JLabel userIDLabel = new JLabel("User ID:");
JLabel passwordLabel = new JLabel("Password:");
loginField = new JTextField(14);
passwordField = new JPasswordField(14);
textPanel.add(userIDLabel);
textPanel.add(loginField);
textPanel.add(passwordLabel);
textPanel.add(passwordField);
loginFrame.add(textPanel);
loginFrame.add(buttonPanel);
loginFrame.setVisible(true);
private void registrationFrame()
loginFrame.setVisible(false);
//Registration's Frame
registrationFrame.setTitle("JBank -- Registration");
registrationFrame.setDefaultLookAndFeelDecorated(true);
registrationFrame.setBounds(400,350,300,300);
registrationFrame.setLayout(new BorderLayout());
//Buttons
JButton registerButton = new JButton("Register");
JButton cancelButton = new JButton("Cancel");
//Text Fields
regNameField = new JTextField(20);
regSSNField = new JTextField(8);
regUserField = new JTextField(14);
regPasswordField = new JPasswordField(14);
//Labels
JLabel nameLabel = new JLabel("Name: ");
JLabel ssnLabel = new JLabel("Social Security: ");
JLabel newUserLabel = new JLabel("Desired User ID: ");
JLabel newPasswordLabel = new JLabel("Desired Password: ");
//Top Panel
JPanel newUserFieldsPanel = new JPanel();
newUserFieldsPanel.setLayout(new GridLayout(8,0));
//Bottom Panel
JPanel newUserButtonsPanel = new JPanel();
newUserButtonsPanel.setLayout(new GridLayout(0,2));
//Add
newUserFieldsPanel.add(nameLabel);
newUserFieldsPanel.add(regNameField);
newUserFieldsPanel.add(ssnLabel);
newUserFieldsPanel.add(regSSNField);
newUserFieldsPanel.add(newUserLabel);
newUserFieldsPanel.add(regUserField);
newUserFieldsPanel.add(newPasswordLabel);
newUserFieldsPanel.add(regPasswordField);
newUserButtonsPanel.add(registerButton);
newUserButtonsPanel.add(cancelButton);
registrationFrame.add(newUserFieldsPanel, BorderLayout.CENTER);
registrationFrame.add(newUserButtonsPanel, BorderLayout.SOUTH);
//Action Listeners
registerButton.setActionCommand(NEW_USER_REGISTER_BUTTON);
cancelButton.setActionCommand(CANCEL_BUTTON);
registerButton.addActionListener(this);
cancelButton.addActionListener(this);
registrationFrame.setVisible(true);
private void newAccountFrame()
//New Account Frame
newAccountFrame.setTitle("Create New Account");
newAccountFrame.setDefaultLookAndFeelDecorated(true);
newAccountFrame.setBounds(400,350,300,300);
newAccountFrame.setLayout(new BorderLayout());
//Buttons
JButton newAcctOkButton = new JButton("OK");
JButton newAcctCancelButton = new JButton("Cancel");
//Radio Buttons
JRadioButton checkingOption = new JRadioButton("Checking Account");
JRadioButton savingsOption = new JRadioButton("Savings Account");
JRadioButton retirementOption = new JRadioButton("Retirement Account");
//Group 'em
ButtonGroup accountSettings = new ButtonGroup();
accountSettings.add(checkingOption);
accountSettings.add(savingsOption);
accountSettings.add(retirementOption);
//Text Fields
initialMoneyField = new JTextField("0", 8);
//Labels
JLabel depositLabel = new JLabel("Initial Deposit: ");
JLabel optionLabel = new JLabel("What kind of account would \n"
+ "you like to create?");
//Top Panel
JPanel newAcctOptionsPanel = new JPanel();
newAcctOptionsPanel.setLayout(new GridLayout(4,0));
//Bottom Panel
JPanel newAcctTextPanel = new JPanel();
newAcctTextPanel.setLayout(new GridLayout(2,2));
//Add
newAcctOptionsPanel.add(optionLabel);
newAcctOptionsPanel.add(checkingOption);
newAcctOptionsPanel.add(savingsOption);
newAcctOptionsPanel.add(retirementOption);
newAcctTextPanel.add(depositLabel);
newAcctTextPanel.add(initialMoneyField);
newAcctTextPanel.add(newAcctOkButton);
newAcctTextPanel.add(newAcctCancelButton);
newAccountFrame.add(newAcctOptionsPanel, BorderLayout.CENTER);
newAccountFrame.add(newAcctTextPanel, BorderLayout.SOUTH);
//Action Listeners
checkingOption.setActionCommand(CHECKING_RADIO_BUTTON);
savingsOption.setActionCommand(SAVINGS_RADIO_BUTTON);
retirementOption.setActionCommand(RETIREMENT_RADIO_BUTTON);
checkingOption.addActionListener(this);
savingsOption.addActionListener(this);
retirementOption.addActionListener(this);
newAcctOkButton.setActionCommand(NEW_ACCT_OK_BUTTON);
newAcctCancelButton.setActionCommand(NEW_ACCT_CANCEL_BUTTON);
newAcctOkButton.addActionListener(this);
newAcctCancelButton.addActionListener(this);
newAccountFrame.setVisible(true);
private boolean checkFields()
//Check Name Field
String triedName = regNameField.getText();
if (triedName.length() == 0)
JOptionPane.showMessageDialog(null,
"Empty Name Field. Try Again.",
"Error Message",
JOptionPane.ERROR_MESSAGE);
return false;
//Check SSN
String triedSS = regSSNField.getText();
int parsedSS = 0;
try
parsedSS = Integer.parseInt(triedSS);
catch(Exception e)
JOptionPane.showMessageDialog(null,
"Numbers only in Social Security Field!\n Try Again.",
"Error Message",
JOptionPane.ERROR_MESSAGE);
return false;
if (triedSS.length() < 8)
JOptionPane.showMessageDialog(null,
"Social Security Number is not 8 Digits.\n Try Again.",
"Error Message",
JOptionPane.ERROR_MESSAGE);
return false;
//Check User ID
String triedUser = regUserField.getText();
if (triedUser.length() < 6)
JOptionPane.showMessageDialog(null,
"Desired User ID too short.\n Try Again",
"Error Message",
JOptionPane.ERROR_MESSAGE);
return false;
//Check Password
char[] triedPassword = regPasswordField.getPassword();
String stringPassword = triedPassword.toString();
if (stringPassword.length() < 6)
JOptionPane.showMessageDialog(null,
"Desired Password Too Short. \n Try Again.",
"Error Message",
JOptionPane.ERROR_MESSAGE);
return false;
return true;
private boolean registerNewUser()
FileOutputStream writer;
try
BufferedWriter out = new BufferedWriter(new FileWriter("logins"));
out.write(regUserField.getText());
char [] tempPass = regPasswordField.getPassword();
String tempString = tempPass.toString();
out.write("\n" + tempString);
out.close();
catch(IOException e)
System.out.println("Writing file error.");
System.exit(0);
int intSS = Integer.parseInt(regSSNField.getText());
currentUserAccount = new Account(regNameField.getText(), intSS);
return true;
private boolean processLogin(String currentFileLoginName, String triedLogin, Scanner loginFile)
char[] userPassword = passwordField.getPassword();
if (currentFileLoginName.equals(triedLogin))
String currentFilePassword = loginFile.nextLine(); //Login recognized, go to next line for password
char[] charPassword = currentFilePassword.toCharArray();
if (charPassword.length == userPassword.length) //Password Lengths match?
if(Arrays.equals(userPassword, charPassword)) //Do characters match?
trueUser = true;
loginFrame.dispose();
return true;
else
JOptionPane.showMessageDialog(null, //Notify User of Incorrect password
"Invalid password. Try again.",
"Error Message",
JOptionPane.ERROR_MESSAGE);
return false;
else
JOptionPane.showMessageDialog(null, //Notify user of unrecognized login
"Unknown User ID. Try again\n or Register.",
"Error Message",
JOptionPane.ERROR_MESSAGE);
return false;
return false;
private class Account
private String name;
private int ssn;
private double totalUserMoney;
private boolean checking = false;
private boolean savings = false;
private boolean retirement = false;
private double checking_holdings;
private double savings_holdings;
private double retirement_holdings;
public Account(String userName, int ss)
name = userName;
ssn = ss;
public int getSSN()
return ssn;
public double getTotalUserMoney()
return totalUserMoney;
public boolean getUserAccounts(String type)
if (type.equals("checking"))
if (checking == false)
return false;
else
return true;
if (type.equals("savings"))
if (savings == false)
return false;
else
return true;
if (type.equals("retirement"))
if (retirement == false)
return false;
else
return true;
return false;
public void registerAccount(String type)
if (type.equals("checking"))
checking = true;
else if (type.equals("savings"))
savings = true;
else if (type.equals("retirement"))
retirement = true;
else
System.out.println("Internal error"); //Should not reach here
public boolean withdraw(String type, Double moneyAmount)
if(getUserAccounts(type))
if(type.equals("checking"))
if (moneyAmount > checking_holdings)
JOptionPane.showMessageDialog(null,"Insufficient holdings in checking account");
else
checking_holdings -= moneyAmount;
totalUserMoney -= moneyAmount;
return true;
if(type.equals("savings"))
if (moneyAmount > checking_holdings)
JOptionPane.showMessageDialog(null,"Insufficient holdings in savings account");
else
savings_holdings -= moneyAmount;
totalUserMoney -= moneyAmount;
return true;
if(type.equals("retirement"))
if (moneyAmount > checking_holdings)
JOptionPane.showMessageDialog(null,"Insufficient holdings in retirement account");
else
retirement_holdings -= moneyAmount;
totalUserMoney -= moneyAmount;
return true;
else
JOptionPane.showMessageDialog(null,"No such account exists");
return false;
public boolean deposit(String type, Double moneyAmount)
if(getUserAccounts(type))
if(type.equals("checking"))
checking_holdings += moneyAmount;
totalUserMoney += moneyAmount;
return true;
if(type.equals("savings"))
savings_holdings += moneyAmount;
totalUserMoney += moneyAmount;
return true;
if(type.equals("retirement"))
retirement_holdings += moneyAmount;
totalUserMoney += moneyAmount;
return true;
else
JOptionPane.showMessageDialog(null,"No such account exists");
return false;
public void deleteAccount(String type)
if (type.equals("checking"))
totalUserMoney -= checking_holdings;
checking = false;
if (type.equals("savings"))
totalUserMoney -= savings_holdings;
savings = false;
if (type.equals("retirement"))
totalUserMoney -= retirement_holdings;
retirement = false;
public void showAccountInfo()
if (checking == true && savings == true && retirement == true)
System.out.println(name + "'s Accounts: " + "\nChecking Account: $" + checking_holdings
+ "\nSavings Account: $" + savings_holdings + "\nRetirement Account: $" +
retirement_holdings + "\n\nTotal: $" + totalUserMoney);
public void showAccountInfo(String type)
System.out.println(name + " ");
}In the future, do not post eleventeenkathousand lines of code. No one is going to read it all and - quite frankly - no one really cares.
As for the issue at hand, whenever you are going to access the file system, a remote server, access the clipboard and a handful of other "security" related issues, you must sign your applet.
Google for sun's tutorial on signing applets. -
How to add a scrollbar to applet
This is the source code of my applet.I wat to have an autoscroll on this applet
i think it is usefull if i put here all the code for my project.
======================================================
Class ConsolePanel:
The file defines a class ConsolePanel. Objects of type
ConsolePanel can be used for simple input/output exchanges with
the user. Various routines are provided for reading and writing
values of various types from the output. (This class gives all
the I/O behavior of another class, Console, that represents a
separate window for doing console-style I/O.)
This class is dependent on another class, ConsoleCanvas.
Note that when the console has the input focus, it is outlined with
a bright blue border. If, in addition, the console is waiting for
user input, then there will be a blinking cursor. If the console
is not outlined in light blue, the user has to click on it before
any input will be accepted.
This is an update an earlier version of the same class,
rewritten to use realToString() for output of floating point
numbers..
package myproj;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JScrollPane;
import javax.swing.JScrollBar;
import javax.swing.*;
public class ConsolePanel extends JTextArea{
static public JScrollPane scrollPane;
// ***************************** Constructors *******************************
public ConsolePanel() { // default constructor just provides default window title and size
setBackground(Color.white);
setLayout(new BorderLayout(0, 0));
canvas = new ConsoleCanvas(500,1000);
scrollPane = new JScrollPane(canvas);
scrollPane.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scrollPane.setPreferredSize( new Dimension( 1000,10000) );
add("Center", scrollPane);
//scrollPane.getVerticalScrollBar().setUnitIncrement(1);
try {
jbInit();
} catch (Exception ex) {
ex.printStackTrace();
public void clear() { // clear all characters from the canvas
canvas.clear();
// *************************** I/O Methods *********************************
// Methods for writing the primitive types, plus type String,
// to the console window, with no extra spaces.
// Note that the real-number data types, float
// and double, a rounded version is output that will
// use at most 10 or 11 characters. If you want to
// output a real number with full accuracy, use
// "con.put(String.valueOf(x))", for example.
public void put(int x) {
put(x, 0);
} // Note: also handles byte and short!
public void put(long x) {
put(x, 0);
public void put(double x) {
put(x, 0);
} // Also handles float.
public void put(char x) {
put(x, 0);
public void put(boolean x) {
put(x, 0);
public void put(String x) {
put(x, 0);
// Methods for writing the primitive types, plus type String,
// to the console window,followed by a carriage return, with
// no extra spaces.
public void putln(int x) {
put(x, 0);
newLine();
} // Note: also handles byte and short!
public void putln(long x) {
put(x, 0);
newLine();
public void putln(double x) {
put(x, 0);
newLine();
} // Also handles float.
public void putln(char x) {
put(x, 0);
newLine();
public void putln(boolean x) {
put(x, 0);
newLine();
public void putln(String x) {
put(x, 0);
newLine();
// Methods for writing the primitive types, plus type String,
// to the console window, with a minimum field width of w,
// and followed by a carriage return.
// If outut value is less than w characters, it is padded
// with extra spaces in front of the value.
public void putln(int x, int w) {
put(x, w);
newLine();
} // Note: also handles byte and short!
public void putln(long x, int w) {
put(x, w);
newLine();
public void putln(double x, int w) {
put(x, w);
newLine();
} // Also handles float.
public void putln(char x, int w) {
put(x, w);
newLine();
public void putln(boolean x, int w) {
put(x, w);
newLine();
public void putln(String x, int w) {
put(x, w);
newLine();
// Method for outputting a carriage return
public void putln() {
newLine();
// Methods for writing the primitive types, plus type String,
// to the console window, with minimum field width w.
public void put(int x, int w) {
dumpString(String.valueOf(x), w);
} // Note: also handles byte and short!
public void put(long x, int w) {
dumpString(String.valueOf(x), w);
public void put(double x, int w) {
dumpString(realToString(x), w);
} // Also handles float.
public void put(char x, int w) {
dumpString(String.valueOf(x), w);
public void put(boolean x, int w) {
dumpString(String.valueOf(x), w);
public void put(String x, int w) {
dumpString(x, w);
// Methods for reading in the primitive types, plus "words" and "lines".
// The "getln..." methods discard any extra input, up to and including
// the next carriage return.
// A "word" read by getlnWord() is any sequence of non-blank characters.
// A "line" read by getlnString() or getln() is everything up to next CR;
// the carriage return is not part of the returned value, but it is
// read and discarded.
// Note that all input methods except getAnyChar(), peek(), the ones for lines
// skip past any blanks and carriage returns to find a non-blank value.
// getln() can return an empty string; getChar() and getlnChar() can
// return a space or a linefeed ('\n') character.
// peek() allows you to look at the next character in input, without
// removing it from the input stream. (Note that using this
// routine might force the user to enter a line, in order to
// check what the next character.)
// Acceptable boolean values are the "words": true, false, t, f, yes,
// no, y, n, 0, or 1; uppercase letters are OK.
// None of these can produce an error; if an error is found in input,
// the user is forced to re-enter.
// Available input routines are:
// getByte() getlnByte() getShort() getlnShort()
// getInt() getlnInt() getLong() getlnLong()
// getFloat() getlnFloat() getDouble() getlnDouble()
// getChar() getlnChar() peek() getAnyChar()
// getWord() getlnWord() getln() getString() getlnString()
// (getlnString is the same as getln and is onlyprovided for consistency.)
public byte getlnByte() {
byte x = getByte();
emptyBuffer();
return x;
public short getlnShort() {
short x = getShort();
emptyBuffer();
return x;
public int getlnInt() {
int x = getInt();
emptyBuffer();
return x;
public long getlnLong() {
long x = getLong();
emptyBuffer();
return x;
public float getlnFloat() {
float x = getFloat();
emptyBuffer();
return x;
public double getlnDouble() {
double x = getDouble();
emptyBuffer();
return x;
public char getlnChar() {
char x = getChar();
emptyBuffer();
return x;
public boolean getlnBoolean() {
boolean x = getBoolean();
emptyBuffer();
return x;
public String getlnWord() {
String x = getWord();
emptyBuffer();
return x;
public String getlnString() {
return getln();
} // same as getln()
public String getln() {
StringBuffer s = new StringBuffer(100);
char ch = readChar();
while (ch != '\n') {
s.append(ch);
ch = readChar();
return s.toString();
public byte getByte() {
return (byte) readInteger( -128L, 127L);
public short getShort() {
return (short) readInteger( -32768L, 32767L);
public int getInt() {
return (int) readInteger((long) Integer.MIN_VALUE,
(long) Integer.MAX_VALUE);
public long getLong() {
return readInteger(Long.MIN_VALUE, Long.MAX_VALUE);
public char getAnyChar() {
return readChar();
public char peek() {
return lookChar();
public char getChar() { // skip spaces & cr's, then return next char
char ch = lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n') {
dumpString("? ", 0);
ch = lookChar();
return readChar();
public float getFloat() { // can return positive or negative infinity
float x = 0.0F;
while (true) {
String str = readRealString();
if (str.equals("")) {
errorMessage("Illegal floating point input.",
"Real number in the range " + Float.MIN_VALUE +
" to " + Float.MAX_VALUE);
} else {
Float f = null;
try {
f = Float.valueOf(str);
} catch (NumberFormatException e) {
errorMessage("Illegal floating point input.",
"Real number in the range " + Float.MIN_VALUE +
" to " + Float.MAX_VALUE);
continue;
if (f.isInfinite()) {
errorMessage("Floating point input outside of legal range.",
"Real number in the range " + Float.MIN_VALUE +
" to " + Float.MAX_VALUE);
continue;
x = f.floatValue();
break;
return x;
public double getDouble() {
double x = 0.0;
while (true) {
String str = readRealString();
if (str.equals("")) {
errorMessage("Illegal floating point input",
"Real number in the range " + Double.MIN_VALUE +
" to " + Double.MAX_VALUE);
} else {
Double f = null;
try {
f = Double.valueOf(str);
} catch (NumberFormatException e) {
errorMessage("Illegal floating point input",
"Real number in the range " + Double.MIN_VALUE +
" to " + Double.MAX_VALUE);
continue;
if (f.isInfinite()) {
errorMessage("Floating point input outside of legal range.",
"Real number in the range " + Double.MIN_VALUE +
" to " + Double.MAX_VALUE);
continue;
x = f.doubleValue();
break;
return x;
public String getWord() {
char ch = lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n') {
dumpString("? ", 0);
ch = lookChar();
StringBuffer str = new StringBuffer(50);
while (ch != ' ' && ch != '\n') {
str.append(readChar());
ch = lookChar();
return str.toString();
public boolean getBoolean() {
boolean ans = false;
while (true) {
String s = getWord();
if (s.equalsIgnoreCase("true") || s.equalsIgnoreCase("t") ||
s.equalsIgnoreCase("yes") || s.equalsIgnoreCase("y") ||
s.equals("1")) {
ans = true;
break;
} else if (s.equalsIgnoreCase("false") || s.equalsIgnoreCase("f") ||
s.equalsIgnoreCase("no") || s.equalsIgnoreCase("n") ||
s.equals("0")) {
ans = false;
break;
} else {
errorMessage("Illegal boolean input value.",
"one of: true, false, t, f, yes, no, y, n, 0, or 1");
return ans;
// ***************** Everything beyond this point is private *******************
// ********************** Utility routines for input/output ********************
private ConsoleCanvas canvas; // the canvas where I/O is displayed
private String buffer = null; // one line read from input
private int pos = 0; // position next char in input line that has
// not yet been processed
private String readRealString() { // read chars from input following syntax of real numbers
StringBuffer s = new StringBuffer(50);
char ch = lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n') {
dumpString("? ", 0);
ch = lookChar();
if (ch == '-' || ch == '+') {
s.append(readChar());
ch = lookChar();
while (ch == ' ') {
readChar();
ch = lookChar();
} while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
if (ch == '.') {
s.append(readChar());
ch = lookChar();
while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
if (ch == 'E' || ch == 'e') {
s.append(readChar());
ch = lookChar();
if (ch == '-' || ch == '+') {
s.append(readChar());
ch = lookChar();
} while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
return s.toString();
private long readInteger(long min, long max) { // read long integer, limited to specified range
long x = 0;
while (true) {
StringBuffer s = new StringBuffer(34);
char ch = lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n') {
dumpString("? ", 0);
ch = lookChar();
if (ch == '-' || ch == '+') {
s.append(readChar());
ch = lookChar();
while (ch == ' ') {
readChar();
ch = lookChar();
} while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
if (s.equals("")) {
errorMessage("Illegal integer input.",
"Integer in the range " + min + " to " + max);
} else {
String str = s.toString();
try {
x = Long.parseLong(str);
} catch (NumberFormatException e) {
errorMessage("Illegal integer input.",
"Integer in the range " + min + " to " + max);
continue;
if (x < min || x > max) {
errorMessage("Integer input outside of legal range.",
"Integer in the range " + min + " to " + max);
continue;
break;
return x;
private static String realToString(double x) {
// Goal is to get a reasonable representation of x in at most
// 10 characters, or 11 characters if x is negative.
if (Double.isNaN(x)) {
return "undefined";
if (Double.isInfinite(x)) {
if (x < 0) {
return "-INF";
} else {
return "INF";
if (Math.abs(x) <= 5000000000.0 && Math.rint(x) == x) {
return String.valueOf((long) x);
String s = String.valueOf(x);
if (s.length() <= 10) {
return s;
boolean neg = false;
if (x < 0) {
neg = true;
x = -x;
s = String.valueOf(x);
if (x >= 0.00005 && x <= 50000000 &&
(s.indexOf('E') == -1 && s.indexOf('e') == -1)) { // trim x to 10 chars max
s = round(s, 10);
s = trimZeros(s);
} else if (x > 1) { // construct exponential form with positive exponent
long power = (long) Math.floor(Math.log(x) / Math.log(10));
String exp = "E" + power;
int numlength = 10 - exp.length();
x = x / Math.pow(10, power);
s = String.valueOf(x);
s = round(s, numlength);
s = trimZeros(s);
s += exp;
} else { // constuct exponential form
long power = (long) Math.ceil( -Math.log(x) / Math.log(10));
String exp = "E-" + power;
int numlength = 10 - exp.length();
x = x * Math.pow(10, power);
s = String.valueOf(x);
s = round(s, numlength);
s = trimZeros(s);
s += exp;
if (neg) {
return "-" + s;
} else {
return s;
private static String trimZeros(String num) { // used by realToString
if (num.indexOf('.') >= 0 && num.charAt(num.length() - 1) == '0') {
int i = num.length() - 1;
while (num.charAt(i) == '0') {
i--;
if (num.charAt(i) == '.') {
num = num.substring(0, i);
} else {
num = num.substring(0, i + 1);
return num;
private static String round(String num, int length) { // used by realToString
if (num.indexOf('.') < 0) {
return num;
if (num.length() <= length) {
return num;
if (num.charAt(length) >= '5' && num.charAt(length) != '.') {
char[] temp = new char[length + 1];
int ct = length;
boolean rounding = true;
for (int i = length - 1; i >= 0; i--) {
temp[ct] = num.charAt(i);
if (rounding && temp[ct] != '.') {
if (temp[ct] < '9') {
temp[ct]++;
rounding = false;
} else {
temp[ct] = '0';
ct--;
if (rounding) {
temp[ct] = '1';
ct--;
// ct is -1 or 0
return new String(temp, ct + 1, length - ct);
} else {
return num.substring(0, length);
private void dumpString(String str, int w) { // output string to console
for (int i = str.length(); i < w; i++) {
canvas.addChar(' ');
for (int i = 0; i < str.length(); i++) {
if ((int) str.charAt(i) >= 0x20 && (int) str.charAt(i) != 0x7F) { // no control chars or delete
canvas.addChar(str.charAt(i));
} else if (str.charAt(i) == '\n' || str.charAt(i) == '\r') {
newLine();
private void errorMessage(String message, String expecting) {
// inform user of error and force user to re-enter.
newLine();
dumpString(" *** Error in input: " + message + "\n", 0);
dumpString(" *** Expecting: " + expecting + "\n", 0);
dumpString(" *** Discarding Input: ", 0);
if (lookChar() == '\n') {
dumpString("(end-of-line)\n\n", 0);
} else {
while (lookChar() != '\n') {
canvas.addChar(readChar());
dumpString("\n\n", 0);
dumpString("Please re-enter: ", 0);
readChar(); // discard the end-of-line character
private char lookChar() { // return next character from input
if (buffer == null || pos > buffer.length()) {
fillBuffer();
if (pos == buffer.length()) {
return '\n';
return buffer.charAt(pos);
private char readChar() { // return and discard next character from input
char ch = lookChar();
pos++;
return ch;
private void newLine() { // output a CR to console
canvas.addCR();
private void fillBuffer() { // Wait for user to type a line and press return,
// and put the typed line into the buffer.
buffer = canvas.readLine();
pos = 0;
private void emptyBuffer() { // discard the rest of the current line of input
buffer = null;
public void clearBuffers() { // I expect this will only be called by
// CanvasApplet when a program ends. It should
// not be called in the middle of a running program.
buffer = null;
canvas.clearTypeAhead();
private void jbInit() throws Exception {
this.setNextFocusableComponent(scrollPane);
this.setToolTipText("");
} // end of class Console
============================================================
Class ConsoleCanvas:
/* A class that implements basic console-oriented input/output, for use with
Console.java and ConsolePanel.java. This class provides the basic character IO.
Higher-leve fucntions (reading and writing numbers, booleans, etc) are provided
in Console.java and ConolePanel.java.
(This vesion of ConsoleCanvas is an udate of an earilier version, rewritten to
be compliand with Java 1.1. David Eck; July 17, 1998.)
(Modified August 16, 1998 to add the
a mousePressed method to ConsoleCanvas. The mousePressed method requests
the focus. This is necessary for Sun's Java implementation -- though not,
apparently for anyone else's. Also added: an isFocusTraversable() method)
MouseListener interface and
Minor modifications, February 9, 2000, some glitches in the graphics.
package myproj;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class ConsoleCanvas extends JTextArea implements FocusListener, KeyListener,
MouseListener {
// public interface, constructor and methods
public ConsoleCanvas(int u,int y) {
addFocusListener(this);
addKeyListener(this);
try {
jbInit();
} catch (Exception ex) {
ex.printStackTrace();
public final String readLine() { // wait for user to enter a line of input;
// Line can only contain characters in the range
// ' ' to '~'.
return doReadLine();
public final void addChar(char ch) { // output PRINTABLE character to console
putChar(ch);
public final void addCR() { // add a CR to the console
putCR();
public synchronized void clear() { // clear console and return cursor to row 0, column 0.
if (OSC == null) {
return;
currentRow = 0;
currentCol = 0;
OSCGraphics.setColor(Color.white);
OSCGraphics.fillRect(4, 4, getSize().width - 8, getSize().height - 8);
OSCGraphics.setColor(Color.black);
repaint();
try {
Thread.sleep(25);
} catch (InterruptedException e) {}
// focus and key event handlers; not meant to be called excpet by system
public void keyPressed(KeyEvent evt) {
doKey(evt.getKeyChar());
public void keyReleased(KeyEvent evt) {}
public void keyTyped(KeyEvent evt) {}
public void focusGained(FocusEvent evt) {
doFocus(true);
public void focusLost(FocusEvent evt) {
doFocus(false);
public boolean isFocusTraversable() {
// Allows the user to move the focus to the canvas
// by pressing the tab key.
return true;
// Mouse listener methods -- here just to make sure that the canvas
// gets the focuse when the user clicks on it. These are meant to
// be called only by the system.
public void mousePressed(MouseEvent evt) {
requestFocus();
public void mouseReleased(MouseEvent evt) {}
public void mouseClicked(MouseEvent evt) {}
public void mouseEntered(MouseEvent evt) {}
public void mouseExited(MouseEvent evt) {}
// implementation section: protected variables and methods.
protected StringBuffer typeAhead = new StringBuffer();
// Characters typed by user but not yet processed;
// User can "type ahead" the charcters typed until
// they are needed to satisfy a readLine.
protected final int maxLineLength = 256;
// No lines longer than this are returned by readLine();
// The system effectively inserts a CR after 256 chars
// of input without a carriage return.
protected int rows, columns; // rows and columns of chars in the console
protected int currentRow, currentCol; // current curson position
protected Font font; // Font used in console (Courier); All font
// data is set up in the doSetup() method.
protected int lineHeight; // height of one line of text in the console
protected int baseOffset; // distance from top of a line to its baseline
protected int charWidth; // width of a character (constant, since a monospaced font is used)
protected int leading; // space between lines
protected int topOffset; // distance from top of console to top of text
protected int leftOffset; // distance from left of console to first char on line
protected Image OSC; // off-screen backup for console display (except cursor)
protected Graphics OSCGraphics; // graphics context for OSC
protected boolean hasFocus = false; // true if this canvas has the input focus
protected boolean cursorIsVisible = false; // true if cursor is currently visible
private int pos = 0; // exists only for sharing by next two methods
public synchronized void clearTypeAhead() {
// clears any unprocessed user typing. This is meant only to
// be called by ConsolePanel, when a program being run by
// console Applet ends. But just to play it safe, pos is
// set to -1 as a signal to doReadLine that it should return.
typeAhead.setLength(0);
pos = -1;
notify();
protected synchronized String doReadLine() { // reads a line of input, up to next CR
if (OSC == null) { // If this routine is called before the console has
// completely opened, we shouldn't procede; give the
// window a chance to open, so that paint() can call doSetup().
try {
wait(5000);
} catch (InterruptedException e) {} // notify() should be set by doSetup()
if (OSC == null) { // If nothing has happened for 5 seconds, we are probably in
// trouble, but when the heck, try calling doSetup and proceding anyway.
doSetup();
if (!hasFocus) { // Make sure canvas has input focus
requestFocus();
StringBuffer lineBuffer = new StringBuffer(); // buffer for constructing line from user
pos = 0;
while (true) { // Read and process chars from the typeAhead buffer until a CR is found.
while (pos >= typeAhead.length()) { // If the typeAhead buffer is empty, wait for user to type something
cursorBlink();
try {
wait(500);
} catch (InterruptedException e) {}
if (pos == -1) { // means clearTypeAhead was called;
return ""; // this is an abnormal return that should not happen
if (cursorIsVisible) {
cursorBlink();
if (typeAhead.charAt(pos) == '\r' || typeAhead.charAt(pos) == '\n') {
putCR();
pos++;
break;
if (typeAhead.charAt(pos) == 8 || typeAhead.charAt(pos) == 127) {
if (lineBuffer.length() > 0) {
lineBuffer.setLength(lineBuffer.length() - 1);
eraseChar();
pos++;
} else if (typeAhead.charAt(pos) >= ' ' &&
typeAhead.charAt(pos) < 127) {
putChar(typeAhead.charAt(pos));
lineBuffer.append(typeAhead.charAt(pos));
pos++;
} else {
pos++;
if (lineBuffer.length() == maxLineLength) {
putCR();
pos = typeAhead.length();
break;
if (pos >= typeAhead.length()) { // delete all processed chars from typeAhead
typeAhead.setLength(0);
} else {
int len = typeAhead.length();
for (int i = pos; i < len; i++) {
typeAhead.setCharAt(i - pos, typeAhead.charAt(i));
typeAhead.setLength(len - pos);
return lineBuffer.toString(); // return the string that was entered
protected synchronized void doKey(char ch) { // process key pressed by user
typeAhead.append(ch);
notify();
private void putCursor(Graphics g) { // draw the cursor
g.drawLine(leftOffset + currentCol * charWidth + 1,
topOffset + (currentRow * lineHeight),
leftOffset + currentCol * charWidth + 1,
topOffset + (currentRow * lineHeight + baseOffset));
protected synchronized void putChar(char ch) { // draw ch at cursor position and move cursor
if (OSC == null) { // If this routine is called before the console has
// completely opened, we shouldn't procede; give the
// window a chance to open, so that paint() can call doSetup().
try {
wait(5000);
} catch (InterruptedException e) {} // notify() should be set by doSetup()
if (OSC == null) { // If nothing has happened for 5 seconds, we are probably in
// trouble, but when the heck, try calling doSetup and proceding anyway.
doSetup();
if (currentCol >= columns) {
putCR();
currentCol++;
Graphics g = getGraphics();
g.setColor(Color.black);
g.setFont(font);
char[] fudge = new char[1];
fudge[0] = ch;
g.drawChars(fudge, 0, 1, leftOffset + (currentCol - 1) * charWidth,
topOffset + currentRow * lineHeight + baseOffset);
g.dispose();
OSCGraphics.drawChars(fudge, 0, 1,
leftOffset + (currentCol - 1) * charWidth,
topOffset + currentRow * lineHeight + baseOffset);
protected void eraseChar() { // erase char before cursor position and move cursor
if (currentCol == 0 && currentRow == 0) {
return;
currentCol--;
if (currentCol < 0) {
currentRow--;
currentCol = columns - 1;
Graphics g = getGraphics();
g.setColor(Color.white);
g.fillRect(leftOffset + (currentCol * charWidth),
topOffset + (currentRow * lineHeight),
charWidth, lineHeight - 1);
g.dispose();
OSCGraphics.setColor(Color.white);
OSCGraphics.fillRect(leftOffset + (currentCol * charWidth),
topOffset + (currentRow * lineHeight),
charWidth, lineHeight - 1);
OSCGraphics.setColor(Color.black);
protected synchronized void putCR() { // move cursor to start of next line, scrolling window if necessary
if (OSC == null) { // If this routine is called before the console has
// completely opened, we shouldn't procede; give the
// window a chance to open, so that paint() can call doSetup().
try {
wait(5000);
} catch (InterruptedException e) {} // notify() should be set by doSetup()
if (OSC == null) { // If nothing has happened for 5 seconds, we are probably in
// trouble, but when the heck, try calling doSetup and proceding anyway.
doSetup();
currentCol = 0;
currentRow++;
if (currentRow < rows) {
return;
OSCGraphics.copyArea(leftOffset, topOffset + lineHeight,
columns * charWidth,
(rows - 1) * lineHeight - leading, 0, -lineHeight);
OSCGraphics.setColor(Color.white);
OSCGraphics.fillRect(leftOffset, topOffset + (rows - 1) * lineHeight,
columns * charWidth, lineHeight - leading);
OSCGraphics.setColor(Color.black);
currentRow = rows - 1;
Graphics g = getGraphics();
paint(g);
g.dispose();
try {
Thread.sleep(20);
} catch (InterruptedException e) {}
protected void cursorBlink() { // toggle visibility of cursor (but don't show it if focus has been lost)
if (cursorIsVisible) {
Graphics g = getGraphics();
g.setColor(Color.white);
putCursor(g);
cursorIsVisible = false;
g.dispose();
} else if (hasFocus) {
Graphics g = getGraphics();
g.setColor(Color.black);
putCursor(g);
cursorIsVisible = true;
g.dispose();
protected synchronized void doFocus(boolean focus) { // react to gain or loss of focus
if (OSC == null) {
doSetup();
hasFocus = focus;
if (hasFocus) { // the rest of the routine draws or erases border around canvas
OSCGraphics.setColor(Color.cyan);
} else {
OSCGraphics.setColor(Color.white);
int w = getSize().width;
int h = getSize().height;
for (int i = 0; i < 3; i++) {
OSCGraphics.drawRect(i, i, w - 2 * i, h - 2 * i);
OSCGraphics.drawLine(0, h - 3, w, h - 3);
OSCGraphics.drawLine(w - 3, 0, w - 3, h);
OSCGraphics.setColor(Color.black);
repaint();
try {
Thread.sleep(50);
} catch (InterruptedException e) {}
notify();
protected void doSetup() { // get font parameters and create OSC
int w = getSize().width;
int h = getSize().height;
font = new Font("Courier", Font.PLAIN, getFont().getSize());
FontMetrics fm = getFontMetrics(font);
lineHeight = fm.getHeight();
leading = fm.getLeading();
baseOffset = fm.getAscent();
charWidth = fm.charWidth('W');
columns = (w - 12) / charWidth;
rows = (h - 12 + leading) / lineHeight;
leftOffset = (w - columns * charWidth) / 2;
topOffset = (h + leading - rows * lineHeight) / 2;
OSC = createImage(w, h);
OSCGraphics = OSC.getGraphics();
OSCGraphics.setFont(font);
OSCGraphics.setColor(Color.white);
OSCGraphics.fillRect(0, 0, w, h);
OSCGraphics.setColor(Color.black);
notify();
public void update(Graphics g) {
paint(g);
public synchronized void paint(Graphics g) {
if (OSC == null) {
doSetup();
g.drawImage(OSC, 0, 0, this);
private void jbInit() throws Exception {
===============================================================
and finally Consola:
package myproj;
/* The Consola provides a basis for writing applets that simulate
line-oriented consola-type input/output. The class ConsoleCanvas is
used to provide the I/O routines; these routines type output into
the ConsoleCanvas and read input typed there by the user. See the
files CanvasPanel.java and ConsoleCanvas.java for information.
A consola applet is set up to run one particular program. The applet
includes a button that the user presses to run the program (or to
abort it when it is running). It also includes a label, which by default
is "Java I/O consola". The default program, defined in this file,
is a simple Hello World program.
To write a new consola applet, with a more interesting program, you
should create a subclass of Consola. The subclass should
override the method program() , which represents the program to
be run. The program should use the instance variable, consola, to
do input/output. For example, consola.putln("HelloWorld.")
or N=consola.getInt(). All the public methods of class ConsolePanel
can be called in the program.
(Of course, you could also just modify this file, instead of
writing a subclass.)
import java.awt.*;
import java.awt.event.*;
import myproj.ConsoleCanvas;
import myproj.ConsolePanel;
import java.util.*;
import javax.swing.JScrollPane;
import javax.swing.JList;
import javax.swing.*;
import java.io.*;
public class Consola extends java.applet.Applet implements Runnable,
ActionListener {
public Consola() {
try {
jbInit();
} catch (Exception ex) {
ex.printStackTrace();
protected String title = "Configure Vlan "; // (Used for compatibility with previous versions of consola Applet)
protected String getTitle() {
// Return a label to appears over the consola;
// If you want to change the label, override this
// method to return a different string.
return title;
//variabilele mele
static String[] Foo={"Fa0/1","Fa0/2","Fa0/3","Fa0/4","Fa0/5","Fa0/6","Fa0/7","Fa0/8","Fa0/9","F a0/10","Fa0/11","Fa0/12"};
static String[] vlan={"","","","","","","","","","","",""};
static String [] showdefault={"","","","","","","","","","","",""};
statFirst thing...you made a mistake
import javax.swing.JScrollPane;
import javax.swing.JScrollBar;
import javax.swing.*;When you import javax.swing.*; You automatically
import JScrollPane & JScrollBar class, there's no
need for you to re import again...
That is not always a mistake. There are cases where it makes sense to do both (i.e., to import both '*' and a specific class name from that package at the same time). I believe the common example is:
import java.awt.*;
import java.util.*;
import java.util.List;Now you can use "List" as a short name for "java.util.List", but must use "java.awt.List" in full for "java.awt.List" objects. If you just did:
import java.awt.*;
import java.util.*;Then you couldn't use List as a short name for anything--because it is ambiguous. You'd have to use both "java.awt.List" and "java.util.List" spelled out in full.
Or, if you did:
import java.awt.*;
import java.util.*;
import java.awt.List; // NOTE CHANGEThen "List" is short for "java.awt.List", and you must use "java.util.List" in full for "java.awt.List" objects. -
Help With adding a scrollbar to my applet
This is the source code of my applet.I wat to have an autoscroll on this applet
i think it is usefull if i put here all the code for my project.
======================================================
Class ConsolePanel:
The file defines a class ConsolePanel. Objects of type
ConsolePanel can be used for simple input/output exchanges with
the user. Various routines are provided for reading and writing
values of various types from the output. (This class gives all
the I/O behavior of another class, Console, that represents a
separate window for doing console-style I/O.)
This class is dependent on another class, ConsoleCanvas.
Note that when the console has the input focus, it is outlined with
a bright blue border. If, in addition, the console is waiting for
user input, then there will be a blinking cursor. If the console
is not outlined in light blue, the user has to click on it before
any input will be accepted.
This is an update an earlier version of the same class,
rewritten to use realToString() for output of floating point
numbers..
package myproj;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JScrollPane;
import javax.swing.JScrollBar;
import javax.swing.*;
public class ConsolePanel extends JTextArea{
static public JScrollPane scrollPane;
// ***************************** Constructors *******************************
public ConsolePanel() { // default constructor just provides default window title and size
setBackground(Color.white);
setLayout(new BorderLayout(0, 0));
canvas = new ConsoleCanvas(500,1000);
scrollPane = new JScrollPane(canvas);
scrollPane.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scrollPane.setPreferredSize( new Dimension( 1000,10000) );
add("Center", scrollPane);
//scrollPane.getVerticalScrollBar().setUnitIncrement(1);
try {
jbInit();
} catch (Exception ex) {
ex.printStackTrace();
public void clear() { // clear all characters from the canvas
canvas.clear();
// *************************** I/O Methods *********************************
// Methods for writing the primitive types, plus type String,
// to the console window, with no extra spaces.
// Note that the real-number data types, float
// and double, a rounded version is output that will
// use at most 10 or 11 characters. If you want to
// output a real number with full accuracy, use
// "con.put(String.valueOf(x))", for example.
public void put(int x) {
put(x, 0);
} // Note: also handles byte and short!
public void put(long x) {
put(x, 0);
public void put(double x) {
put(x, 0);
} // Also handles float.
public void put(char x) {
put(x, 0);
public void put(boolean x) {
put(x, 0);
public void put(String x) {
put(x, 0);
// Methods for writing the primitive types, plus type String,
// to the console window,followed by a carriage return, with
// no extra spaces.
public void putln(int x) {
put(x, 0);
newLine();
} // Note: also handles byte and short!
public void putln(long x) {
put(x, 0);
newLine();
public void putln(double x) {
put(x, 0);
newLine();
} // Also handles float.
public void putln(char x) {
put(x, 0);
newLine();
public void putln(boolean x) {
put(x, 0);
newLine();
public void putln(String x) {
put(x, 0);
newLine();
// Methods for writing the primitive types, plus type String,
// to the console window, with a minimum field width of w,
// and followed by a carriage return.
// If outut value is less than w characters, it is padded
// with extra spaces in front of the value.
public void putln(int x, int w) {
put(x, w);
newLine();
} // Note: also handles byte and short!
public void putln(long x, int w) {
put(x, w);
newLine();
public void putln(double x, int w) {
put(x, w);
newLine();
} // Also handles float.
public void putln(char x, int w) {
put(x, w);
newLine();
public void putln(boolean x, int w) {
put(x, w);
newLine();
public void putln(String x, int w) {
put(x, w);
newLine();
// Method for outputting a carriage return
public void putln() {
newLine();
// Methods for writing the primitive types, plus type String,
// to the console window, with minimum field width w.
public void put(int x, int w) {
dumpString(String.valueOf(x), w);
} // Note: also handles byte and short!
public void put(long x, int w) {
dumpString(String.valueOf(x), w);
public void put(double x, int w) {
dumpString(realToString(x), w);
} // Also handles float.
public void put(char x, int w) {
dumpString(String.valueOf(x), w);
public void put(boolean x, int w) {
dumpString(String.valueOf(x), w);
public void put(String x, int w) {
dumpString(x, w);
// Methods for reading in the primitive types, plus "words" and "lines".
// The "getln..." methods discard any extra input, up to and including
// the next carriage return.
// A "word" read by getlnWord() is any sequence of non-blank characters.
// A "line" read by getlnString() or getln() is everything up to next CR;
// the carriage return is not part of the returned value, but it is
// read and discarded.
// Note that all input methods except getAnyChar(), peek(), the ones for lines
// skip past any blanks and carriage returns to find a non-blank value.
// getln() can return an empty string; getChar() and getlnChar() can
// return a space or a linefeed ('\n') character.
// peek() allows you to look at the next character in input, without
// removing it from the input stream. (Note that using this
// routine might force the user to enter a line, in order to
// check what the next character.)
// Acceptable boolean values are the "words": true, false, t, f, yes,
// no, y, n, 0, or 1; uppercase letters are OK.
// None of these can produce an error; if an error is found in input,
// the user is forced to re-enter.
// Available input routines are:
// getByte() getlnByte() getShort() getlnShort()
// getInt() getlnInt() getLong() getlnLong()
// getFloat() getlnFloat() getDouble() getlnDouble()
// getChar() getlnChar() peek() getAnyChar()
// getWord() getlnWord() getln() getString() getlnString()
// (getlnString is the same as getln and is onlyprovided for consistency.)
public byte getlnByte() {
byte x = getByte();
emptyBuffer();
return x;
public short getlnShort() {
short x = getShort();
emptyBuffer();
return x;
public int getlnInt() {
int x = getInt();
emptyBuffer();
return x;
public long getlnLong() {
long x = getLong();
emptyBuffer();
return x;
public float getlnFloat() {
float x = getFloat();
emptyBuffer();
return x;
public double getlnDouble() {
double x = getDouble();
emptyBuffer();
return x;
public char getlnChar() {
char x = getChar();
emptyBuffer();
return x;
public boolean getlnBoolean() {
boolean x = getBoolean();
emptyBuffer();
return x;
public String getlnWord() {
String x = getWord();
emptyBuffer();
return x;
public String getlnString() {
return getln();
} // same as getln()
public String getln() {
StringBuffer s = new StringBuffer(100);
char ch = readChar();
while (ch != '\n') {
s.append(ch);
ch = readChar();
return s.toString();
public byte getByte() {
return (byte) readInteger( -128L, 127L);
public short getShort() {
return (short) readInteger( -32768L, 32767L);
public int getInt() {
return (int) readInteger((long) Integer.MIN_VALUE,
(long) Integer.MAX_VALUE);
public long getLong() {
return readInteger(Long.MIN_VALUE, Long.MAX_VALUE);
public char getAnyChar() {
return readChar();
public char peek() {
return lookChar();
public char getChar() { // skip spaces & cr's, then return next char
char ch = lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n') {
dumpString("? ", 0);
ch = lookChar();
return readChar();
public float getFloat() { // can return positive or negative infinity
float x = 0.0F;
while (true) {
String str = readRealString();
if (str.equals("")) {
errorMessage("Illegal floating point input.",
"Real number in the range " + Float.MIN_VALUE +
" to " + Float.MAX_VALUE);
} else {
Float f = null;
try {
f = Float.valueOf(str);
} catch (NumberFormatException e) {
errorMessage("Illegal floating point input.",
"Real number in the range " + Float.MIN_VALUE +
" to " + Float.MAX_VALUE);
continue;
if (f.isInfinite()) {
errorMessage("Floating point input outside of legal range.",
"Real number in the range " + Float.MIN_VALUE +
" to " + Float.MAX_VALUE);
continue;
x = f.floatValue();
break;
return x;
public double getDouble() {
double x = 0.0;
while (true) {
String str = readRealString();
if (str.equals("")) {
errorMessage("Illegal floating point input",
"Real number in the range " + Double.MIN_VALUE +
" to " + Double.MAX_VALUE);
} else {
Double f = null;
try {
f = Double.valueOf(str);
} catch (NumberFormatException e) {
errorMessage("Illegal floating point input",
"Real number in the range " + Double.MIN_VALUE +
" to " + Double.MAX_VALUE);
continue;
if (f.isInfinite()) {
errorMessage("Floating point input outside of legal range.",
"Real number in the range " + Double.MIN_VALUE +
" to " + Double.MAX_VALUE);
continue;
x = f.doubleValue();
break;
return x;
public String getWord() {
char ch = lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n') {
dumpString("? ", 0);
ch = lookChar();
StringBuffer str = new StringBuffer(50);
while (ch != ' ' && ch != '\n') {
str.append(readChar());
ch = lookChar();
return str.toString();
public boolean getBoolean() {
boolean ans = false;
while (true) {
String s = getWord();
if (s.equalsIgnoreCase("true") || s.equalsIgnoreCase("t") ||
s.equalsIgnoreCase("yes") || s.equalsIgnoreCase("y") ||
s.equals("1")) {
ans = true;
break;
} else if (s.equalsIgnoreCase("false") || s.equalsIgnoreCase("f") ||
s.equalsIgnoreCase("no") || s.equalsIgnoreCase("n") ||
s.equals("0")) {
ans = false;
break;
} else {
errorMessage("Illegal boolean input value.",
"one of: true, false, t, f, yes, no, y, n, 0, or 1");
return ans;
// ***************** Everything beyond this point is private *******************
// ********************** Utility routines for input/output ********************
private ConsoleCanvas canvas; // the canvas where I/O is displayed
private String buffer = null; // one line read from input
private int pos = 0; // position next char in input line that has
// not yet been processed
private String readRealString() { // read chars from input following syntax of real numbers
StringBuffer s = new StringBuffer(50);
char ch = lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n') {
dumpString("? ", 0);
ch = lookChar();
if (ch == '-' || ch == '+') {
s.append(readChar());
ch = lookChar();
while (ch == ' ') {
readChar();
ch = lookChar();
} while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
if (ch == '.') {
s.append(readChar());
ch = lookChar();
while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
if (ch == 'E' || ch == 'e') {
s.append(readChar());
ch = lookChar();
if (ch == '-' || ch == '+') {
s.append(readChar());
ch = lookChar();
} while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
return s.toString();
private long readInteger(long min, long max) { // read long integer, limited to specified range
long x = 0;
while (true) {
StringBuffer s = new StringBuffer(34);
char ch = lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n') {
dumpString("? ", 0);
ch = lookChar();
if (ch == '-' || ch == '+') {
s.append(readChar());
ch = lookChar();
while (ch == ' ') {
readChar();
ch = lookChar();
} while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
if (s.equals("")) {
errorMessage("Illegal integer input.",
"Integer in the range " + min + " to " + max);
} else {
String str = s.toString();
try {
x = Long.parseLong(str);
} catch (NumberFormatException e) {
errorMessage("Illegal integer input.",
"Integer in the range " + min + " to " + max);
continue;
if (x < min || x > max) {
errorMessage("Integer input outside of legal range.",
"Integer in the range " + min + " to " + max);
continue;
break;
return x;
private static String realToString(double x) {
// Goal is to get a reasonable representation of x in at most
// 10 characters, or 11 characters if x is negative.
if (Double.isNaN(x)) {
return "undefined";
if (Double.isInfinite(x)) {
if (x < 0) {
return "-INF";
} else {
return "INF";
if (Math.abs(x) <= 5000000000.0 && Math.rint(x) == x) {
return String.valueOf((long) x);
String s = String.valueOf(x);
if (s.length() <= 10) {
return s;
boolean neg = false;
if (x < 0) {
neg = true;
x = -x;
s = String.valueOf(x);
if (x >= 0.00005 && x <= 50000000 &&
(s.indexOf('E') == -1 && s.indexOf('e') == -1)) { // trim x to 10 chars max
s = round(s, 10);
s = trimZeros(s);
} else if (x > 1) { // construct exponential form with positive exponent
long power = (long) Math.floor(Math.log(x) / Math.log(10));
String exp = "E" + power;
int numlength = 10 - exp.length();
x = x / Math.pow(10, power);
s = String.valueOf(x);
s = round(s, numlength);
s = trimZeros(s);
s += exp;
} else { // constuct exponential form
long power = (long) Math.ceil( -Math.log(x) / Math.log(10));
String exp = "E-" + power;
int numlength = 10 - exp.length();
x = x * Math.pow(10, power);
s = String.valueOf(x);
s = round(s, numlength);
s = trimZeros(s);
s += exp;
if (neg) {
return "-" + s;
} else {
return s;
private static String trimZeros(String num) { // used by realToString
if (num.indexOf('.') >= 0 && num.charAt(num.length() - 1) == '0') {
int i = num.length() - 1;
while (num.charAt(i) == '0') {
i--;
if (num.charAt(i) == '.') {
num = num.substring(0, i);
} else {
num = num.substring(0, i + 1);
return num;
private static String round(String num, int length) { // used by realToString
if (num.indexOf('.') < 0) {
return num;
if (num.length() <= length) {
return num;
if (num.charAt(length) >= '5' && num.charAt(length) != '.') {
char[] temp = new char[length + 1];
int ct = length;
boolean rounding = true;
for (int i = length - 1; i >= 0; i--) {
temp[ct] = num.charAt(i);
if (rounding && temp[ct] != '.') {
if (temp[ct] < '9') {
temp[ct]++;
rounding = false;
} else {
temp[ct] = '0';
ct--;
if (rounding) {
temp[ct] = '1';
ct--;
// ct is -1 or 0
return new String(temp, ct + 1, length - ct);
} else {
return num.substring(0, length);
private void dumpString(String str, int w) { // output string to console
for (int i = str.length(); i < w; i++) {
canvas.addChar(' ');
for (int i = 0; i < str.length(); i++) {
if ((int) str.charAt(i) >= 0x20 && (int) str.charAt(i) != 0x7F) { // no control chars or delete
canvas.addChar(str.charAt(i));
} else if (str.charAt(i) == '\n' || str.charAt(i) == '\r') {
newLine();
private void errorMessage(String message, String expecting) {
// inform user of error and force user to re-enter.
newLine();
dumpString(" *** Error in input: " + message + "\n", 0);
dumpString(" *** Expecting: " + expecting + "\n", 0);
dumpString(" *** Discarding Input: ", 0);
if (lookChar() == '\n') {
dumpString("(end-of-line)\n\n", 0);
} else {
while (lookChar() != '\n') {
canvas.addChar(readChar());
dumpString("\n\n", 0);
dumpString("Please re-enter: ", 0);
readChar(); // discard the end-of-line character
private char lookChar() { // return next character from input
if (buffer == null || pos > buffer.length()) {
fillBuffer();
if (pos == buffer.length()) {
return '\n';
return buffer.charAt(pos);
private char readChar() { // return and discard next character from input
char ch = lookChar();
pos++;
return ch;
private void newLine() { // output a CR to console
canvas.addCR();
private void fillBuffer() { // Wait for user to type a line and press return,
// and put the typed line into the buffer.
buffer = canvas.readLine();
pos = 0;
private void emptyBuffer() { // discard the rest of the current line of input
buffer = null;
public void clearBuffers() { // I expect this will only be called by
// CanvasApplet when a program ends. It should
// not be called in the middle of a running program.
buffer = null;
canvas.clearTypeAhead();
private void jbInit() throws Exception {
this.setNextFocusableComponent(scrollPane);
this.setToolTipText("");
} // end of class Console
============================================================
Class ConsoleCanvas:
/* A class that implements basic console-oriented input/output, for use with
Console.java and ConsolePanel.java. This class provides the basic character IO.
Higher-leve fucntions (reading and writing numbers, booleans, etc) are provided
in Console.java and ConolePanel.java.
(This vesion of ConsoleCanvas is an udate of an earilier version, rewritten to
be compliand with Java 1.1. David Eck; July 17, 1998.)
(Modified August 16, 1998 to add the
a mousePressed method to ConsoleCanvas. The mousePressed method requests
the focus. This is necessary for Sun's Java implementation -- though not,
apparently for anyone else's. Also added: an isFocusTraversable() method)
MouseListener interface and
Minor modifications, February 9, 2000, some glitches in the graphics.
package myproj;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class ConsoleCanvas extends JTextArea implements FocusListener, KeyListener,
MouseListener {
// public interface, constructor and methods
public ConsoleCanvas(int u,int y) {
addFocusListener(this);
addKeyListener(this);
try {
jbInit();
} catch (Exception ex) {
ex.printStackTrace();
public final String readLine() { // wait for user to enter a line of input;
// Line can only contain characters in the range
// ' ' to '~'.
return doReadLine();
public final void addChar(char ch) { // output PRINTABLE character to console
putChar(ch);
public final void addCR() { // add a CR to the console
putCR();
public synchronized void clear() { // clear console and return cursor to row 0, column 0.
if (OSC == null) {
return;
currentRow = 0;
currentCol = 0;
OSCGraphics.setColor(Color.white);
OSCGraphics.fillRect(4, 4, getSize().width - 8, getSize().height - 8);
OSCGraphics.setColor(Color.black);
repaint();
try {
Thread.sleep(25);
} catch (InterruptedException e) {}
// focus and key event handlers; not meant to be called excpet by system
public void keyPressed(KeyEvent evt) {
doKey(evt.getKeyChar());
public void keyReleased(KeyEvent evt) {}
public void keyTyped(KeyEvent evt) {}
public void focusGained(FocusEvent evt) {
doFocus(true);
public void focusLost(FocusEvent evt) {
doFocus(false);
public boolean isFocusTraversable() {
// Allows the user to move the focus to the canvas
// by pressing the tab key.
return true;
// Mouse listener methods -- here just to make sure that the canvas
// gets the focuse when the user clicks on it. These are meant to
// be called only by the system.
public void mousePressed(MouseEvent evt) {
requestFocus();
public void mouseReleased(MouseEvent evt) {}
public void mouseClicked(MouseEvent evt) {}
public void mouseEntered(MouseEvent evt) {}
public void mouseExited(MouseEvent evt) {}
// implementation section: protected variables and methods.
protected StringBuffer typeAhead = new StringBuffer();
// Characters typed by user but not yet processed;
// User can "type ahead" the charcters typed until
// they are needed to satisfy a readLine.
protected final int maxLineLength = 256;
// No lines longer than this are returned by readLine();
// The system effectively inserts a CR after 256 chars
// of input without a carriage return.
protected int rows, columns; // rows and columns of chars in the console
protected int currentRow, currentCol; // current curson position
protected Font font; // Font used in console (Courier); All font
// data is set up in the doSetup() method.
protected int lineHeight; // height of one line of text in the console
protected int baseOffset; // distance from top of a line to its baseline
protected int charWidth; // width of a character (constant, since a monospaced font is used)
protected int leading; // space between lines
protected int topOffset; // distance from top of console to top of text
protected int leftOffset; // distance from left of console to first char on line
protected Image OSC; // off-screen backup for console display (except cursor)
protected Graphics OSCGraphics; // graphics context for OSC
protected boolean hasFocus = false; // true if this canvas has the input focus
protected boolean cursorIsVisible = false; // true if cursor is currently visible
private int pos = 0; // exists only for sharing by next two methods
public synchronized void clearTypeAhead() {
// clears any unprocessed user typing. This is meant only to
// be called by ConsolePanel, when a program being run by
// console Applet ends. But just to play it safe, pos is
// set to -1 as a signal to doReadLine that it should return.
typeAhead.setLength(0);
pos = -1;
notify();
protected synchronized String doReadLine() { // reads a line of input, up to next CR
if (OSC == null) { // If this routine is called before the console has
// completely opened, we shouldn't procede; give the
// window a chance to open, so that paint() can call doSetup().
try {
wait(5000);
} catch (InterruptedException e) {} // notify() should be set by doSetup()
if (OSC == null) { // If nothing has happened for 5 seconds, we are probably in
// trouble, but when the heck, try calling doSetup and proceding anyway.
doSetup();
if (!hasFocus) { // Make sure canvas has input focus
requestFocus();
StringBuffer lineBuffer = new StringBuffer(); // buffer for constructing line from user
pos = 0;
while (true) { // Read and process chars from the typeAhead buffer until a CR is found.
while (pos >= typeAhead.length()) { // If the typeAhead buffer is empty, wait for user to type something
cursorBlink();
try {
wait(500);
} catch (InterruptedException e) {}
if (pos == -1) { // means clearTypeAhead was called;
return ""; // this is an abnormal return that should not happen
if (cursorIsVisible) {
cursorBlink();
if (typeAhead.charAt(pos) == '\r' || typeAhead.charAt(pos) == '\n') {
putCR();
pos++;
break;
if (typeAhead.charAt(pos) == 8 || typeAhead.charAt(pos) == 127) {
if (lineBuffer.length() > 0) {
lineBuffer.setLength(lineBuffer.length() - 1);
eraseChar();
pos++;
} else if (typeAhead.charAt(pos) >= ' ' &&
typeAhead.charAt(pos) < 127) {
putChar(typeAhead.charAt(pos));
lineBuffer.append(typeAhead.charAt(pos));
pos++;
} else {
pos++;
if (lineBuffer.length() == maxLineLength) {
putCR();
pos = typeAhead.length();
break;
if (pos >= typeAhead.lengHi
I don't understand the exact need you want
you want to add Scrolling facility to your Entire Applet or only for the Textarea Class?
In first case
Create the ScrollPane and add it to the applet contentPane. and put entire components to a Panel and just add it to scroll pane.
Regards
Vinoth -
Creation of an applet JApplet in a desktop JDesktopPane
how its posible to load from a jar file an applet which come from package my.package.myclass of the jar file.
next i want to put it in a JInternalFrame and put this desktop frame in a JDesktopPane.
indeed i can move the applet around with other applets in a little window!
here's the code of the desktop_panel.javapackage kevin_shell;
import kevin_shell.Kdemos.*;
import java.awt.*;
import java.awt.event.*;
import java2d.MemoryMonitor;
//import java2d.demos.Lines.*;
import javax.swing.*;
import javax.swing.border.BevelBorder;
import javax.swing.border.Border;
import com.l2fprod.gui.plaf.skin.Skin;
import com.l2fprod.gui.plaf.skin.SkinLookAndFeel;
public class desktop_panel extends JPanel {
JInternalFrame win_info = new JInternalFrame();
public void killme(KDemo demo) {
demo = null;
public void view_image(String file) {
thread_load_cube load = new thread_load_cube(file);
load.start();
JPanel jPanel2 = new JPanel();
JDesktopPane pan_workspace = new JDesktopPane();
public void paint(Graphics p) {
p.setColor(Color.blue);
p.fillRect(0, 0, 1000, 1000);
p.setColor(Color.red);
p.drawString("kevin OS", 10, 10);
super.paint(p);
BorderLayout borderLayout1 = new BorderLayout();
JPanel jPanel3 = new JPanel();
JButton jButton1 = new JButton();
JInternalFrame win_memory = new JInternalFrame();
JInternalFrame win_terminal = new JInternalFrame();
MemoryMonitor win_mem = new MemoryMonitor();
KClock win_perf = new KClock();
JPanel jPanel4 = new JPanel();
JLabel jLabel1 = new JLabel();
JButton jButton2 = new JButton();
JLabel jLabel6 = new JLabel();
JLabel jLabel4 = new JLabel();
JButton but_collect = new JButton();
JButton but_refresh = new JButton();
JTextField nb_free = new JTextField();
Border border1;
Border border2;
JLabel jLabel2 = new JLabel();
JTextField ed_jdk_path = new JTextField();
JTextField nb_total = new JTextField();
JLabel jLabel3 = new JLabel();
JLabel jLabel5 = new JLabel();
bean_clock bean_clock1 = new bean_clock();
JPanel jPanel5 = new JPanel();
JPanel jPanel1 = new JPanel();
JTabbedPane tabber = new JTabbedPane();
BorderLayout borderLayout2 = new BorderLayout();
JList list1 = new JList();
JList list_system = new JList();
JList list3 = new JList();
JButton jButton3 = new JButton();
JButton jButton4 = new JButton();
JButton jButton5 = new JButton();
JButton jButton6 = new JButton();
test_applet Itest_applet = new test_applet();
JButton jButton7 = new JButton();
public desktop_panel() {
try {
jbInit();
System.out.println("initializing desk");
bean_clock1.setLocation(0, 0);
bean_clock1.setSize(win_info.getPreferredSize());
//bean_clock1.start();
pan_workspace.add(win_info);
win_info.show();
win_info.setLocation(0, 0);
win_info.setSize(win_info.getPreferredSize());
//Class bruno=java.lang.ClassLoader.getSystemClassLoader().loadClass("demo_cube");
//Object b=bruno.newInstance();
pan_workspace.add(win_memory);
win_memory.show();
win_memory.setSize(win_memory.getPreferredSize());
pan_workspace.add(win_terminal);
win_terminal.show();
win_terminal.setSize(win_terminal.getPreferredSize());
pan_workspace.add(win_mem);
win_mem.setVisible(true);
win_mem.setSize(win_mem.getPreferredSize());
pan_workspace.add(win_perf);
win_perf.setVisible(true);
win_perf.setSize(100, 100);
win_perf.setLocation(400, 400);
win_perf.startClock();
//list_system.add("welcome to kevin os");
//tabber.add(list_system);
tabber.add(list1);
tabber.add(list3);
win_terminal.getContentPane().add(tabber, BorderLayout.CENTER);
win_terminal.setSize(300, 300);
win_terminal.setResizable(true);
win_terminal.setLocation(400, 400);
System.out.println("ok");
} catch (Exception e) {
e.printStackTrace();
class thread_load_cube extends Thread {
String file;
thread_load_cube() {
file = "pics/babe1.jpg";
thread_load_cube(String f) {
file = f;
//win_cube
public void run() {
try {
System.out.println("cube loading");
Class demo = java.lang.ClassLoader.getSystemClassLoader().
loadClass("kevin_shell.Kdemos.demo_cube");
KDemo win_cube = (KDemo) demo.newInstance();
//list_system.add("win cube (loading....)");
java.net.URL stoneURL = main_win.class.getResource(file);
java.net.URL skyURL = main_win.class.getResource(
"pics/babe2.jpg");
//win_cube=new demo_cube();
win_cube.set_parameters(stoneURL, skyURL);
//pan_workspace.add(win_cube);
win_cube.show();
win_cube.setLocation(300, 300);
win_cube.setSize(300, 300);
win_cube.setResizable(true);
win_cube.setTitle("java 3d cube");
win_cube.setIconifiable(true);
win_cube.init();
win_cube.setClosable(true);
System.out.println("ok");
} catch (ClassNotFoundException e) {
e.printStackTrace();
System.out.println("problem with class");
} catch (IllegalAccessException e) {
e.printStackTrace();
System.out.println("acces problem");
} catch (InstantiationException e) {
e.printStackTrace();
System.out.println("instance");
class thread_load_j3d extends Thread {
public void run() {
//list_system.add("j3d test loading...");
//kev
try {
Class demo = java.lang.ClassLoader.getSystemClassLoader().
loadClass("kevin_shell.Kdemos.demo_j3d");
KDemo win = (KDemo) demo.newInstance();
//pan_workspace.add(win);
win.show();
win.setLocation(300, 300);
win.setSize(300, 300);
win.setResizable(true);
win.setTitle("j3d test");
win.setIconifiable(true);
win.init();
win.setClosable(true);
System.out.println("ok");
} catch (ClassNotFoundException e) {
e.printStackTrace();
System.out.println("problem with class");
} catch (IllegalAccessException e) {
e.printStackTrace();
System.out.println("acces problem");
} catch (InstantiationException e) {
e.printStackTrace();
System.out.println("instance");
private void jbInit() throws Exception {
border1 = BorderFactory.createMatteBorder(4, 4, 4, 4,
new Color(91, 91, 91));
border2 = BorderFactory.createBevelBorder(BevelBorder.RAISED,
Color.white, Color.white,
new Color(153, 153, 204),
new Color(153, 153, 204));
jButton2.setBackground(Color.white);
jButton2.setBorder(BorderFactory.createLineBorder(Color.black));
jButton2.setPreferredSize(new Dimension(70, 70));
//jButton2.setIcon(new ImageIcon(desktop_panel.class.getResource("icons/on_kevin.gif")));
jButton2.setMargin(new Insets(0, 0, 0, 0));
jButton2.setBounds(new Rectangle(9, 6, 52, 54));
jLabel1.setFont(new java.awt.Font("Dialog", 1, 70));
jLabel1.setForeground(SystemColor.desktop);
jLabel1.setText("kevin os 1.0");
jLabel1.setBounds(new Rectangle(66, 6, 255, 22));
this.setLayout(borderLayout1);
this.setBackground(UIManager.getColor("EditorPane.selectionBackground"));
jPanel2.setLayout(null);
jPanel2.setBackground(UIManager.getColor(
"InternalFrame.activeTitleBackground"));
jPanel2.setMaximumSize(new Dimension(100, 100));
jPanel2.setMinimumSize(new Dimension(100, 100));
jPanel2.setPreferredSize(new Dimension(100, 100));
jPanel3.setBackground(new Color(255, 231, 0));
jPanel3.setPreferredSize(new Dimension(60, 10));
jButton1.setBackground(Color.white);
jButton1.setBorder(BorderFactory.createLineBorder(Color.black));
jButton1.setPreferredSize(new Dimension(50, 50));
//jButton1.setIcon(new ImageIcon(desktop_panel.class.getResource("icons/info.gif")));
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(MouseEvent e) {
jButton1_mouseClicked(e);
pan_workspace.setBackground(UIManager.getColor(
"List.selectionBackground"));
pan_workspace.setOpaque(false);
pan_workspace.setAlignmentX((float) 0.0);
pan_workspace.setAlignmentY((float) 0.0);
pan_workspace.setLayout(null);
win_memory.setToolTipText("");
win_memory.getContentPane().setBackground(SystemColor.controlDkShadow);
win_memory.setTitle("memory");
win_memory.setBorder(border2);
win_memory.setIconifiable(true);
win_memory.setNormalBounds(new Rectangle(10, 10, 381, 254));
win_memory.setPreferredSize(new Dimension(381, 254));
win_memory.setMinimumSize(new Dimension(381, 254));
win_info.setFrameIcon(null);
win_info.setPreferredSize(new Dimension(269, 230));
win_info.setMinimumSize(new Dimension(269, 230));
win_info.setBorder(border2);
win_info.getContentPane().setBackground(UIManager.getColor(
"CheckBoxMenuItem.selectionBackground"));
win_info.setMaximumSize(new Dimension(100, 100));
win_info.setResizable(true);
win_info.setIconifiable(true);
win_info.setTitle("kevin OS info");
but_collect.setBackground(Color.orange);
but_collect.setText("garbage collector");
but_collect.setBounds(new Rectangle(13, 114, 162, 31));
but_collect.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(MouseEvent e) {
but_collect_mouseClicked(e);
but_refresh.setText("refresh");
but_refresh.setBounds(new Rectangle(11, 150, 162, 32));
but_refresh.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(MouseEvent e) {
but_refresh_mouseClicked(e);
nb_free.setBackground(Color.white);
nb_free.setDisabledTextColor(Color.white);
nb_free.setEditable(false);
nb_free.setBounds(new Rectangle(107, 40, 108, 22));
jPanel4.setBackground(UIManager.getColor(
"InternalFrame.activeTitleBackground"));
jLabel2.setBackground(Color.pink);
jLabel2.setFont(new java.awt.Font("Dialog", 1, 50));
jLabel2.setForeground(Color.red);
jLabel2.setText("-OS-");
jLabel2.setBounds(new Rectangle(98, 12, 139, 52));
ed_jdk_path.setBackground(Color.white);
ed_jdk_path.setDisabledTextColor(Color.white);
ed_jdk_path.setEditable(false);
ed_jdk_path.setBounds(new Rectangle(104, 14, 190, 22));
nb_total.setBackground(Color.white);
nb_total.setDisabledTextColor(Color.white);
nb_total.setEditable(false);
nb_total.setBounds(new Rectangle(228, 40, 108, 22));
jLabel3.setToolTipText("");
jLabel3.setText("free");
jLabel3.setBounds(new Rectangle(106, 70, 112, 16));
jLabel5.setBounds(new Rectangle(228, 70, 112, 16));
jLabel5.setText("total");
jLabel5.setToolTipText("");
win_terminal.setTitle("terminal");
jPanel5.setLayout(borderLayout2);
jButton3.setPreferredSize(new Dimension(50, 27));
jButton3.setText("cube");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton3_actionPerformed(e);
jButton3.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(MouseEvent e) {
jButton3_mouseClicked(e);
jButton4.setText("test");
jButton4.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(MouseEvent e) {
jButton4_mouseClicked(e);
jButton5.setText("skin cool");
jButton5.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(MouseEvent e) {
jButton5_mouseClicked(e);
jButton6.setText("skin xp");
jButton6.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(MouseEvent e) {
jButton6_mouseClicked(e);
jButton7.setText("test applet");
jButton7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton7_actionPerformed(e);
win_memory.getContentPane().add(jPanel4, BorderLayout.CENTER);
jPanel4.setLayout(null);
jPanel4.setMinimumSize(new Dimension(100, 100));
jPanel4.setPreferredSize(new Dimension(100, 100));
jLabel6.setText("java memory");
jLabel6.setBounds(new Rectangle(16, 40, 78, 18));
jLabel4.setText("jdk path");
jLabel4.setBounds(new Rectangle(18, 16, 76, 18));
this.add(jPanel3, BorderLayout.WEST);
jPanel3.add(jButton7);
jPanel3.add(jButton1, null);
jPanel3.add(jButton3, null);
jPanel3.add(jButton4, null);
jPanel3.add(jButton5, null);
jPanel3.add(jButton6, null);
this.add(pan_workspace, java.awt.BorderLayout.CENTER);
jPanel4.add(jLabel4, null);
jPanel4.add(jLabel6, null);
jPanel4.add(but_collect, null);
jPanel4.add(ed_jdk_path, null);
jPanel4.add(nb_free, null);
jPanel4.add(nb_total, null);
jPanel4.add(but_refresh, null);
jPanel4.add(jLabel3, null);
jPanel4.add(jLabel5, null);
win_info.getContentPane().add(jPanel2, BorderLayout.CENTER);
jPanel2.add(jButton2, null);
jPanel2.add(jLabel1, null);
jPanel2.add(jLabel2, null);
tabber.add(list1, "list1");
tabber.add(list_system, "list_system");
tabber.add(list3, "list3");
void but_refresh_mouseClicked(MouseEvent e) {
nb_free.setText(String.valueOf(java.lang.Runtime.getRuntime().
freeMemory()));
nb_total.setText(String.valueOf(java.lang.Runtime.getRuntime().
totalMemory()));
void jButton1_mouseClicked(MouseEvent e) {
win_info.show();
win_info.setLocation(0, 0);
//win_info.setSize(100,100);
void but_collect_mouseClicked(MouseEvent e) {
java.lang.Runtime.getRuntime().gc();
but_refresh_mouseClicked(e);
//list_system.add("collecting memory");
void jButton3_mouseClicked(MouseEvent e) {
//win_cube.begin_anim();
void jButton4_mouseClicked(MouseEvent e) {
thread_load_j3d load = new thread_load_j3d();
load.start();
void jButton6_mouseClicked(MouseEvent e) {
try {
Skin skin = null;
//windows xp
skin = SkinLookAndFeel.loadThemePack("skins/BeOS-theme.jar");
// set the skin
SkinLookAndFeel.setSkin(skin);
// ask Swing to use Skin Look And Feel
UIManager.setLookAndFeel(
"com.l2fprod.gui.plaf.skin.SkinLookAndFeel");
SwingUtilities.updateComponentTreeUI(this);
this.validate();
this.updateUI();
} catch (Exception er) {
System.out.println("Failed loading L&F: ");
er.printStackTrace();
void jButton5_mouseClicked(MouseEvent e) {
try {
Skin skin = null;
skin = SkinLookAndFeel.loadThemePack("skins/themepack.zip");
// set the skin
SkinLookAndFeel.setSkin(skin);
// ask Swing to use Skin Look And Feel
UIManager.setLookAndFeel(
"com.l2fprod.gui.plaf.skin.SkinLookAndFeel");
} catch (Exception er) {
er.printStackTrace();
void jButton3_actionPerformed(ActionEvent e) {
thread_load_cube load = new thread_load_cube();
load.start();
public void jButton7_actionPerformed(ActionEvent e) {
JApplet applet=null;
frame_applet frame=null;
try{
//ExtClassLoader ecl = new ExtClassLoader("/home/kevinet/CODE/JAVA/jlguiapplet2.3.1-selfsigned/lib/jlguiapplet2.3.jar");
//Class demo = ecl.loadClass("javazoom.jlgui.player.amp.PlayerApplet");
Class demo = java.lang.ClassLoader.getSystemClassLoader().loadClass("kevin_shell.Kdemos.test_applet");
applet = (JApplet) demo.newInstance();
frame=new frame_applet(applet);
} catch (ClassNotFoundException cnfe) {
cnfe.printStackTrace();
System.out.println("problem with class");
catch (IllegalAccessException iae) {
iae.printStackTrace();
System.out.println("acces problem");
catch (InstantiationException ie) {
ie.printStackTrace();
System.out.println("instance");
System.out.println("hello");
pan_workspace.add(frame);
applet.init();
//applet.setLocation(0,0);
applet.start();
frame.setVisible(true);
frame.show();
frame.setLocation(300, 300);
frame.setSize(300, 300);
frame.setResizable(true);
frame.setTitle("test applet");
frame.setIconifiable(true);
frame.setClosable(true);
}What about calling getLocation on the applet itself?
Otherwise, if you are using Swing, you can try (where "this" is the applet object):
javax.swing.SwingUtilities.getWindowAncestor(this).getLocation();
or
javax.swing.SwingUtilities.convertPointToScreen(this.getLocation(), this);
The latter should work, at least.
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I have an app (target iOS) that needs to be created first in English, then have the content converted to Chinese (which incidentally, I do not know). With TLFtext gone, is this still reasonably easy to do? Is it a matter of including a Chinese font
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I've seen others post similar things, but the cause of the crash is always very specific. Here is the error report: Process: Safari [908] Path: /Applications/Safari.app/Contents/MacOS/Safari Identifier: com.apple.Safari Version: 5.1.7