JApplet, JButtons (Desperate)
Create a JApplet which displays a smiley face (with eyes and mouth) upon startup. Provide two JButtons, labeled "Change Expression" and "Change Color". The "Change Expression" button should cause the face to toggle between a smile and a frown.The "Change Color" button should toggle the fill color of the face between two different colors of your choice, or randomly-generated colors.
Please, can anyone help with this? I welcome any and all help.
Thanks
Jewel24
Kaj, It is Homework. I think that if I could just get this part to get me started. That would be a big help. Create a JApplet which displays a smiley face (with eyes and mouth) upon startup
Similar Messages
-
JApplet not found in Internet Explorer 5.0
I learning how works JApplet's, but I Have a problem.
Somebody can say to me because my code does not work?
My code:
import javax.swing.JApplet;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.text.*;
import javax.swing.event.*;
import javax.swing.border.*;
public class JAppletExample extends JApplet
JButton jb;
BorderLayout layout;
public void init()
layout=new BorderLayout(20,10);
this.setLayout(layout);
jb=new JButton("prueba ");
this.add("Center",jb);
public void start() { }
This is the error message from the Java Console:
java.lang.ClassNotFoundException: javax.swing.JApplet
at com/ms/vm/loader/URLClassLoader.loadClass
at java/lang/ClassLoader.loadClassInternal
at java/lang/ClassLoader.resolveClass
at com/ms/vm/loader/URLClassLoader.loadClass
at com/ms/vm/loader/URLClassLoader.loadClass
at com/ms/applet/AppletPanel.securedClassLoad
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.run
at java/lang/Thread.run
Thanks in advance.You can force Internet Explorer to use the Sun Java Plugin by changing this key into windows registry:
Registry>HKEY_LOCAL_MACHINE>SOFTWARE>JavaSoft>Java Plug-in>1.4.1_02>UseJava2Iexplorer
Modify the value REG_DWORD from 0x00000000 (0) to 0x00000001 (1). This way you force IE to use your installed Sun Java Virtual Machine (with Swing support) instead the old Microsoft Virtual Machine. -
Hello.. i have the following code which is just like a pulldown menu in an applet on the web. it wokrs fine (u can test it ) but whenever the mouse leaves the button the menuitems remains. i want to implement a mouse or focus action so that when the mouse leaves the buttons or menuitems the menuitems disappear. try compiling and see it for ur self (it is error free).
Thanks.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Test extends JApplet
JButton button, button2;
JPopupMenu jpop, jpop1;
JMenuItem i1 [], i2 [];
JMenu m2, m3, m4;
String si1[] = {"Home", "Corporate Profile", "Our Mission", "Our Clients" , "Careers @ CT Limited"};
String si2[] = {"Debit Card processing", "Credit Card processing", "Stored Value Card", "Card Personalization", "Card Printing", "Sales of POSs", "ATM Management"};
String si3[] = {"Virtual Payment Processes", "e-Payment Solutions", "Proprietary Bank Card"};
String si4[] = {"Biller Service Solutions", "Biller Service Provider", "Merchant Processing"};
public void init ()
getContentPane().setLayout (new FlowLayout());
requestFocus();
jpop = new JPopupMenu ();
jpop1 = new JPopupMenu ();
i1 = new JMenuItem [5];
for (int i = 0; i < si1.length; i++)
i1[i] = new JMenuItem (si1);
jpop.add (i1[i]);
jpop.addSeparator();
m2 = new JMenu ("ETF and Card");
m3 = new JMenu ("Electronic Banking (e-banking) ");
m4 = new JMenu ("Electronic Presentment & Payment ");
jpop1.add (m2);
jpop1.add (m3);
jpop1.add (m4);
i2 = new JMenuItem [7];
for (int i = 0; i < si2.length; i++)
i2 [i] = new JMenuItem (si2[i]);
m2.add (i2[i]);
m2.addSeparator();
button = new JButton ("Move your mouse here");
getContentPane().add (button);
button.addMouseListener (new MouseAdapter ()
public void mouseEntered(MouseEvent evt)
jpop.show (button, 0,25);
button2 = new JButton ("Move your mouse here");
getContentPane().add (button2);
button2.addMouseListener (new MouseAdapter ()
public void mouseEntered(MouseEvent evt)
jpop1.show (button2, 0,25);
getContentPane().addMouseListener (new MouseAdapter ()
public void mouseEntered(FocusEvent me)
jpop.hide();
repaint();Any solution ?....
Thanks. -
How do I totally clear a screen in JApplet? For exmaple, the following code below adds the JLabel "next" over the JButton "go" after th button is clicked, but I can still see the "go" button under the text. Is there a way to clear the screen before adding the JLabel "next"? Thank you.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestValidate extends JApplet
JButton go;
JLabel next;
public void init()
go = new JButton("Go");
getContentPane().setLayout(new FlowLayout());
getContentPane().add(go);
go.addActionListener(new goListener());
public void next()
next = new JLabel("Next");
getContentPane().removeAll();
getContentPane().add(next);
getContentPane().validate();
public class goListener implements ActionListener
public void actionPerformed(ActionEvent e)
next();
}use the repaint() method
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestValidate extends JApplet
JButton go;
JLabel next;
public void init()
go = new JButton("Go");
getContentPane().setLayout(new FlowLayout());
getContentPane().add(go);
go.addActionListener(new goListener());
public void next()
next = new JLabel("Next");
getContentPane().removeAll();
getContentPane().add(next);
getContentPane().validate();
repaint();
public class goListener implements ActionListener
public void actionPerformed(ActionEvent e)
next();
} -
import java.io.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.filechooser.*;
import java.applet.*;
public class Mplayer extends Applet
JButton openButton;
JButton cancelButton;
JFileChooser fc;
int returnVal;
public void init()
fc = new JFileChooser();
returnVal = fc.showOpenDialog(this);
public void start()
if(returnVal == JFileChooser.APPROVE_OPTION)
File file = fc.getSelectedFile();
String path = file.getPath();
System.out.println("Opening: " +file.getPath());
else
System.out.println("Cancelled by user");
-- this code can be compiled, but when i open this applet, the 1st error is about java.security.AccessControlException, i think got some problem about " returnVal = fc.showOpenDialog(this);".. can help me to figure out..?? --Try this: this (ie: 'grant{ ...' isn't an Internet solution but it should allow you to use your app locally in appletviewer and develop your skills unhindered
// not tested
import java.io.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.filechooser.*;
public class Mplayer extends JApplet{
JButton openButton;
JButton cancelButton;
JFileChooser fc= new JFileChooser();
int returnVal;
public void init(){
grant{ permission java.security.AllPermission; };
returnVal = fc.showOpenDialog(this);
if(returnVal == JFileChooser.APPROVE_OPTION){
File file = fc.getSelectedFile();
String path = file.getPath();
System.out.println("Opening: " +file.getPath());
else System.out.println("Cancelled by user"); -
Java.lang.NullPointerException what?
how could i fix the error java.lang.NullPointerException associated with this code?
import java.applet.Applet;
import java.awt.*;
import javax.swing.*;
public class Visual extends JApplet {
JButton[] theCase;
public Visual() {
theCase = new JButton[26];
ImageIcon[] casePic;
casePic = new ImageIcon[26];
for(int caseImgLoop=0; caseImgLoop<26; caseImgLoop++)
casePic[caseImgLoop] = new ImageIcon("H:/Images/caseF" + (caseImgLoop + 1) + ".jpg");
for(int caseLoop=0; caseLoop<26; caseLoop++)
//error on the next line
theCase[caseLoop].setIcon(casePic[caseLoop]);
theCase[caseLoop].setBorder(BorderFactory.createEmptyBorder());
public void init() {
Visual go = new Visual();
setSize(400,300);
}casePic[caseImgLoop] = new ImageIcon("H:/Images/caseF" + (caseImgLoop + 1) + ".jpg");You knew you needed to actually create the ImageIcon objects in this array, so why did you not do likewise for the theCase array of JButton objects? You never created the JButton objects, so when you got to this line:
theCase[caseLoop].setIcon(casePic[caseLoop]);theCase[caseLoop] == null at this point. -
How do you set the focus for a JComboBox? When I use the addFocusListener on a JComboBox it does NOT gain or lose any focus. But when applied to a JButton you'll see it gain and lose focus. Is this a bug in java for the JComboBox?
Here's an example of the usage
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Test extends JApplet {
MyFocusListener focuslistener = new MyFocusListener();
JButton button_1 = new JButton("regular button 1");
JComboBox combo_2 = new JComboBox(new Object[] { "item1", "item2" } );
public void init() {
Container contentPane = getContentPane();
combo_2.setNextFocusableComponent(button_1);
button_1.addFocusListener(focuslistener);
combo_2.addFocusListener(focuslistener); //<--------- Add listener here
contentPane.setLayout(new FlowLayout());
contentPane.add(button_1);
contentPane.add(combo_2);
class MyFocusListener implements FocusListener
public void focusGained(FocusEvent e)
Object object = e.getSource();
System.out.println("OBJECT: " + object);
public void focusLost(FocusEvent e)
System.out.println("Focus lost" + e);This is a quick hack to the focuslistener added to a JComboBox. I noticed that inorder to obtain some focus on a JComboBox you must requestFocus on it. Therefore what I do is I requestFocus right after the button has lost focus. Might not be the best thing to do but it's a quick hack.
Code listed below.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Test extends JApplet {
JButton button_1 = new JButton("regular button 1");
JComboBox combo_2 = new JComboBox(new Object[] { "item1", "item2" } );
MyFocusListener focuslistener = new MyFocusListener();
MyComboListener combolistener = new MyComboListener();
public void init() {
Container contentPane = getContentPane();
combo_2.setNextFocusableComponent(button_1);
button_1.addFocusListener(focuslistener);
combo_2.addFocusListener(combolistener);
contentPane.setLayout(new FlowLayout());
contentPane.add(button_1);
contentPane.add(combo_2);
button_1.requestFocus();
class MyFocusListener implements FocusListener
public void focusGained(FocusEvent e)
Object object = e.getSource();
System.out.println("Button gained Focus");
public void focusLost(FocusEvent e)
System.out.println("Button lost Focus");
combo_2.requestFocus(); //<------------ This is the trick
class MyComboListener implements FocusListener
public void focusGained(FocusEvent e)
Object object = e.getSource();
System.out.println("COMBO gained Focus");
public void focusLost(FocusEvent e)
System.out.println("COMBO lost Focus");
} -
Having trouble with my signed applet(if it's properly signed that is)
hi
I'm having trouble with my supposedly signed applet. I'm trying to execute a specific program in this case trilian from my browser. i'm using firefox
first my java code
package applet;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class RunApplet extends JApplet {
JButton jButton = new JButton();
FlowLayout flowLayout1 = new FlowLayout();
public RunApplet() {
try {
init();
} catch (Exception ex) {
ex.printStackTrace();
private void init() throws Exception {
try {
this.getContentPane().setLayout(flowLayout1);
this.setSize(new Dimension(100, 200));
jButton.setText("Trillian");
jButton.addActionListener(new RunApplet_jButton_actionAdapter(this,
"\"C:\\Program Files\\Trillian\\trillian.exe\""));
this.getContentPane().add(jButton, null);
} catch (Exception e) {
e.printStackTrace();
class RunApplet_jButton_actionAdapter implements ActionListener {
private RunApplet adaptee;
private String programPath;
RunApplet_jButton_actionAdapter(RunApplet adaptee, String programPath) {
this.adaptee = adaptee;
this.programPath = programPath;
public void actionPerformed(ActionEvent e) {
try {
Runtime.getRuntime().exec(this.programPath);
} catch (IOException ex) {
}And my applet code
<html>
<body>
<!--"CONVERTED_APPLET"-->
<!-- HTML CONVERTER -->
<object
classid = "clsid:CAFEEFAC-0015-0000-0005-ABCDEFFEDCBA"
codebase = "http://java.sun.com/update/1.5.0/jinstall-1_5_0_05-windows-i586.cab#Version=5,0,50,5"
>
<PARAM NAME = CODE VALUE = "applet.RunApplet.class" >
<PARAM NAME = ARCHIVE VALUE = "myfile.jar" >
<param name = "type" value = "application/x-java-applet;jpi-version=1.5.0_05">
<param name = "scriptable" value = "false">
<comment>
<embed
type = "application/x-java-applet;jpi-version=1.5.0_05" \
CODE = "applet.RunApplet.class" \
ARCHIVE = "myfile.jar"
scriptable = false
pluginspage = "http://java.sun.com/products/plugin/index.html#download">
<noembed>
</noembed>
</embed>
</comment>
</object>
<!--
<applet CODE = "applet.RunApplet.class" ARCHIVE = "myfile.jar">
</applet>
-->
<!--"END_CONVERTED_APPLET"-->
</body>
</html>Creating my key:
keytool -genkey -alias sitekey -keystore "C:\Program Files\Java\jdk1.5.0_05\jre\lib\security\cacerts"Now the process of creating the jar file and signing it:
1. jar cf myfile.jar *.class
2. jarsigner -keystore "C:\Program Files\Java\
jdk1.5.0_05\jre\lib\security\cacerts" myfile.jar sitekeyNow this is the way i've been using then and the first time i get the "do you want to trust" screen but still i get a security exception.
Exception in thread "AWT-EventQueue-10" java.security.AccessControlException: access denied (java.io.FilePermission <<ALL FILES>> execute)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkExec(Unknown Source)
at java.lang.ProcessBuilder.start(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at applet.RunApplet_jButton_actionAdapter.actionPerformed(RunApplet.java:73)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)Is there anybody who have an idea what can be wrong?
regards
thallishok i solved i myself. i assigned a different and thereby correct keystore and now it works like it should
regards
thallish -
This is a semi-continuation of another thread in the 'new to java' forum. I'm learning swing and I'm looking for help as I go. Right now I've got a 'lil mini-gui that will let you point to any folder and it will list all of the files subfolders, sufiles, sub-sub files, etc. in that folder. The problem now is that if I resize the window or it loses focus, the list gets wiped. Also the scrollpane isn't scrolling.
QQ
Any suggestions?
package formshow;
//import java.applet.*;
import javax.swing.*;
import java.io.*;
import java.util.*;
import java.awt.event.*;
public class Sync extends JApplet
JButton bttn1;
JComboBox Cbox_drives, Cbox_folders;
JPanel panel;
JFrame aframe;
JScrollPane FilePane;
DefaultListModel Filelistmodel;
JList Filelist;
class OnlyPRE implements FilenameFilter
Vector PRE;
public OnlyPRE(Vector PRE)
{this.PRE = PRE;}
public boolean accept(File dir, String name)
boolean accept = false;
for (int i=0; i<PRE.size(); i++)
if (name.startsWith((String)PRE.get(i)))
accept = true;
return accept;
public void init()
//this applet
this.setSize(800,150);
//jpanel
panel = new JPanel(null);
//Button init stuff
bttn1 = new JButton("HAI ROLDR!!!");
bttn1.setSize(150,50);
bttn1.setLocation(0,100);
bttn1.addActionListener( new ActionListener()
public void actionPerformed(ActionEvent evt)
{PopList();}
panel.add(bttn1);
//Cbox_drives init stuff
int offset = 'a';
Cbox_drives = new JComboBox();
for (int i=0; i<26; i++)
Cbox_drives.addItem((char)(offset+i)+":\\");
Cbox_drives.setSize(150,50);
Cbox_drives.setLocation(0,0);
Cbox_drives.addActionListener( new ActionListener()
public void actionPerformed(ActionEvent evt)
{getPatFolders();}
panel.add(Cbox_drives);
//Cbox_folders init stuff
Cbox_folders = new JComboBox();
Cbox_folders.setLocation(0,50);
Cbox_folders.setSize(150,50);
Cbox_folders.addItem("Pick the drive letter you have mapped to 1416_a");
panel.add(Cbox_folders);
//Filelist init stuff
Filelist = new JList();
Filelist.setVisibleRowCount(5);
//FilePane init stuff
FilePane = new JScrollPane(Filelist);
FilePane.setLocation(150,0);
FilePane.setSize(650,150);
panel.add(FilePane);
getContentPane().add(panel);
private int getPatFolders()
String drive = (String)Cbox_drives.getSelectedItem();
Vector prelist = new Vector();
prelist.addElement("PAT");
prelist.addElement("REL");
prelist.addElement("EME");
FilenameFilter onlyget = new OnlyPRE(prelist);
Cbox_folders.removeAllItems();
File rootFolder = new File(drive);
String files[] = rootFolder.list(onlyget);
for (int i=0; i<files.length; i++)
Cbox_folders.addItem((String)files);
return (1);
private int PopList()
File StartFolder = new File(((String)Cbox_drives.getSelectedItem())+
((String)Cbox_folders.getSelectedItem()));
Filelistmodel = getFiles(StartFolder);
Filelist.removeAll();
Filelist = new JList(Filelistmodel);
FilePane = new JScrollPane(Filelist);
FilePane.setLocation(150,0);
FilePane.setSize(650,150);
panel.add(FilePane);
getContentPane().invalidate();
getContentPane().validate();
return(1);
private DefaultListModel getFiles(File ThisPath)
DefaultListModel ThisLevel = new DefaultListModel();
String FileList[] = ThisPath.list();
for (int i=0; i<FileList.length; i++)
File afile = new File(ThisPath.getAbsolutePath()+"\\"+FileList[i]);
if (afile.isFile())
ThisLevel.addElement(afile.getAbsolutePath());
else
append(ThisLevel,getFiles(afile));
return ThisLevel;
private DefaultListModel append(DefaultListModel Left, DefaultListModel Right)
for (int i=0; i<Right.getSize();i++)
Left.addElement(Right.get(i));
return Left;Can I embed a JFrame in a web page?Proves you really are a beginner. JFrame is used when developing applications for the Desktop, such as your standard ms word, excel, etc applications. Java is not only restricted to running from a browser and a greater percentage of all current java software created using swing are desktop apps.
If you really are interested in swing, then you should be looking at creating a Desktop application rather than an Applet (unless you required to do so at the moment). Besides, your current code looks more like an attempt at making a desktop application than an applet, IMHO.
ICE -
My applet doesn't run in a browser.
I written the following code:
import javax.swing.*;
public class Logo extends JApplet
JButton button ;
Icon icon;
JPanel panel;
public void init()
icon = new ImageIcon("smilogo.gif");
button = new JButton(icon);
panel = new JPanel();
panel.add(button);
getContentPane().add(panel);
I also have my html file with the code :
<HTML>
<HEAD></HEAD>
<BODY >
<CENTER>
<APPLET code = "Logo.class" width = "100" height = "100"></APPLET>
</CENTER>
</BODY>
</HTML>
when I run the html file with the appletviewer the image gets loaded like I
expect it to. But when I run the file in a browser (IE version 5)after converting
it using the HTMLConverter, the image doesn't load.
What could be the problem. The code was compiled with J2sdk1.4.0.It's a JApplet, it needs the java plug in....
If you've already got the plugin installed you'll just need to change the tag you're using to load the applet... it'll either be an embed tag or an object tag.. (embed for Netscape, Object for IE)... -
hi, this is the coding im working on , it will compile nicely on blueJ but somehow showStatus wont work. Status bar is empty.
Thanks for the time :)
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.awt.geom.*;
import javax.swing.*;
public class makmal5c extends JApplet {
JButton poligaris = new JButton("Poligaris");
JButton poligon = new JButton("Poligon");
poligaris_b pol1 = new poligaris_b();
poligon_b pol2 = new poligon_b();
JPanel inface = new JPanel();
Container pane = getContentPane();
Panel panel = new Panel();
public void init() {
poligaris.addActionListener(pol1);
poligon.addActionListener(pol2);
inface.setBackground(Color.blue);
inface.add(poligaris);
inface.add(poligon);
pane.add(inface,"North");
pane.add(panel);
public class poligaris_b implements ActionListener{
public void actionPerformed(ActionEvent e){
panel.poligaris();
public class poligon_b implements ActionListener{
public void actionPerformed(ActionEvent e){
panel.poligon();
class Panel extends JApplet implements MouseListener, MouseMotionListener {
static final int SAIZ = 2;
ArrayList segi4;
Rectangle2D rect;
double list_x[] = new double[200];
double list_y[] = new double[200];
int z = 0;
int ind = 0;
public Panel() {
segi4 = new ArrayList();
rect = null;
addMouseListener(this);
addMouseMotionListener(this);
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2 = (Graphics2D) g;
for(int i=0; i<segi4.size(); i++)
g2.draw( (Rectangle2D) segi4.get(i));
if ( ind == 1 ){
GeneralPath n1 = new GeneralPath();
n1.moveTo(list_x[0],list_y[0]);
for(int u=0; u < list_x.length; u++){
if ( list_x[u] != 0 ){
n1.lineTo(list_x[u],list_y[u]);
g2.draw(n1);
ind = 0 ;
if ( ind == 2 ){
GeneralPath n1 = new GeneralPath();
n1.moveTo(list_x[0],list_y[0]);
for(int u=0; u < list_x.length; u++){
if ( list_x[u] != 0 ){
n1.lineTo(list_x[u],list_y[u]);
n1.closePath();
g2.setColor(Color.blue);
g2.fill(n1);
g2.draw(n1);
ind = 0 ;
public Rectangle2D find(Point2D p) {
for (int i=0; i < segi4.size(); i++) {
Rectangle2D r = (Rectangle2D) segi4.get(i);
if (r.contains(p))
return r;
return null;
public void add(Point2D p) {
double x = p.getX();
double y = p.getY();
rect = new Rectangle2D.Double(x-SAIZ/2, y-SAIZ/2, SAIZ, SAIZ);
segi4.add(rect);
repaint();
public void remove(Rectangle2D r) {
if (r == null)
return;
if (r == rect)
rect = null;
segi4.remove(r);
this.repaint();
public void getLine(Point2D p) {
double x = p.getX();
double y = p.getY();
list_x[z] = x-SAIZ/2;
list_y[z] = y-SAIZ/2;
z++;
public void poligaris() {
ind = 1;
repaint();
public void poligon() {
ind = 2;
repaint();
public void mousePressed(MouseEvent e) {
rect = find(e.getPoint());
if (rect == null){
add(e.getPoint());
getLine(e.getPoint());
public void mouseClicked(MouseEvent e) {
rect = find(e.getPoint());
if (rect != null && e.getClickCount() >= 2)
remove(rect);
public void mouseEntered(MouseEvent e) {
public void mouseExited(MouseEvent e) {
public void mouseReleased(MouseEvent e) {
public void mouseMoved(MouseEvent e) {
showStatus("Mouse is currently at "+e.getX()+" , "+e.getY()+e.getPoint());
if (find(e.getPoint()) == null)
setCursor(Cursor.getDefaultCursor());
else
setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
public void mouseDragged(MouseEvent e) {
if (rect != null) {
int x = e.getX();
int y = e.getY();
rect.setFrame(x-SAIZ/2, y-SAIZ/2, SAIZ, SAIZ);
repaint();
}first off check your browser to see if your status bar is enabled.
-
I have a problem with my calculator :(
hi all,
i need some help with my calculator..after i wrote the code i discovered my mistake so i made some changes on the code..the problem is that it's still applying the old code !!
( i didn't forgot to compile it, & i closed all the browsers b4 trying it )
i will appreciate ANY suggestion
P.S : my mistake was with the operations buttons ( add, sub, multip, division ) & the equal button
if it may help, this is the code ( the new one, then the old one )
the new code:
import java.awt.* ; // Container, FlowLayout
import java.awt.event.* ; // ActionEvent, ActionListener
import javax.swing.* ; // JApplet , JButton , JLabal, JTextField
public class Calculator2 extends JApplet implements ActionListener {
// graphical user interface components
JTextField field ;
JButton zero, one, two, three, four, five, six, seven, eight, nine, fraction, clear,
add, sub, multip , division, equal ,sin , cos, tan ,log ,sqrt ,exp ;
// variables
String string = " " ; // to store what is in the text field
String operation ; // to store the operation selected
double operate ; // to store the result of the operation selected
double operand1 , operand2 ; // the operands of the operation
// set up GUI components
public void init ()
Container container = getContentPane ();
container.setLayout ( new FlowLayout () );
// create a text field
field = new JTextField ( 17 );
container.add ( field ) ;
// create buttons
clear = new JButton ( "C" ) ;
clear.addActionListener ( this ) ;
container.add ( clear );
zero = new JButton ( "0" ) ;
zero.addActionListener ( this ) ;
container.add ( zero );
one = new JButton ( "1" ) ;
one.addActionListener ( this ) ;
container.add ( one );
two = new JButton ( "2" ) ;
two.addActionListener ( this ) ;
container.add ( two );
three = new JButton ( "3" ) ;
three.addActionListener ( this ) ;
container.add ( three );
four = new JButton ( "4" ) ;
four.addActionListener ( this ) ;
container.add ( four );
five = new JButton ( "5" ) ;
five.addActionListener ( this ) ;
container.add ( five );
six = new JButton ( "6" ) ;
six.addActionListener ( this ) ;
container.add ( six );
seven = new JButton ( "7" ) ;
seven.addActionListener ( this ) ;
container.add ( seven );
eight = new JButton ( "8" ) ;
eight.addActionListener ( this ) ;
container.add ( eight );
nine = new JButton ( "9" ) ;
nine.addActionListener ( this ) ;
container.add ( nine );
fraction = new JButton ( "." ) ;
fraction.addActionListener ( this ) ;
container.add ( fraction );
add = new JButton ( "+" ) ;
add.addActionListener ( this ) ;
container.add ( add );
sub = new JButton ( "-" ) ;
sub.addActionListener ( this ) ;
container.add ( sub );
multip = new JButton ( "*" ) ;
multip.addActionListener ( this ) ;
container.add ( multip );
division = new JButton ( "�" ) ;
division.addActionListener ( this ) ;
container.add ( division );
sin = new JButton ( "sin" ) ;
sin.addActionListener ( this ) ;
container.add ( sin );
cos = new JButton ( "cos" ) ;
cos.addActionListener ( this ) ;
container.add ( cos );
tan = new JButton ( "tan" ) ;
tan.addActionListener ( this ) ;
container.add ( tan );
log = new JButton ( "log" ) ;
log.addActionListener ( this ) ;
container.add ( log );
sqrt = new JButton ( "sqrt" ) ;
sqrt.addActionListener ( this ) ;
container.add ( sqrt );
exp = new JButton ( "exp" ) ;
exp.addActionListener ( this ) ;
container.add ( exp );
equal = new JButton ( "=" ) ;
equal.addActionListener ( this ) ;
container.add ( equal );
} // end of method init
public void actionPerformed ( ActionEvent event )
// button zero
if ( event.getSource()== zero )
string = string + "0" ;
field.setText ( string ) ;
// button one
else if ( event.getSource()== one )
string = string + "1" ;
field.setText ( string ) ;
// button two
else if ( event.getSource()== two )
string = string + "2" ;
field.setText ( string ) ;
// button three
else if ( event.getSource()== three )
string = string + "3" ;
field.setText ( string ) ;
// button four
else if ( event.getSource()== four )
string = string + "4" ;
field.setText ( string ) ;
// button five
else if ( event.getSource()== five )
string = string + "5" ;
field.setText ( string ) ;
// button six
else if ( event.getSource()== six )
string = string + "6" ;
field.setText ( string ) ;
// button seven
else if ( event.getSource()== seven )
string = string + "7" ;
field.setText ( string ) ;
// button eight
else if ( event.getSource()== eight )
string = string + "8" ;
field.setText ( string ) ;
// button nine
else if ( event.getSource()== nine )
string = string + "9" ;
field.setText ( string ) ;
// button fraction
else if ( event.getSource()== fraction )
string = string + "." ;
field.setText ( string ) ;
// button clear
else if ( event.getSource()== clear )
clear ();
// button add
else if ( event.getSource()== add )
operand1 = Double.parseDouble ( string );
operation = "+" ;
clear ();
// button sub
else if ( event.getSource()== sub )
operand1 = Double.parseDouble ( string );
operation = "-" ;
clear ();
// button multip
else if ( event.getSource()== multip )
operand1 = Double.parseDouble ( string );
operation = "*" ;
clear ();
// button division
else if ( event.getSource()== division )
operand1 = Double.parseDouble ( string );
operation = "/" ;
clear ();
// button sin
else if ( event.getSource()== sin )
operate = Double.parseDouble ( string ) ;
operate = Math.sin( operate );
field.setText ( Double.toString ( operate ) ) ;
// button cos
else if ( event.getSource()== cos )
operate = Double.parseDouble ( string ) ;
operate = Math.cos( operate );
field.setText ( Double.toString ( operate ) ) ;
// button tan
else if ( event.getSource()== tan )
operate = Double.parseDouble ( string ) ;
operate = Math.tan( operate );
field.setText ( Double.toString ( operate ) ) ;
// button log
else if ( event.getSource()== log )
operate = Double.parseDouble ( string ) ;
operate = Math.log( operate );
field.setText ( Double.toString ( operate ) ) ;
// button sqrt
else if ( event.getSource()== sqrt )
operate = Double.parseDouble ( string ) ;
operate = Math.sqrt( operate );
field.setText ( Double.toString ( operate ) ) ;
// button exp
else if ( event.getSource()== exp )
operate = Double.parseDouble ( string ) ;
operate = Math.exp( operate );
field.setText ( Double.toString ( operate ) ) ;
// button equal
else // if ( event.getSource()== equal )
operand2 = Double.parseDouble ( string );
if ( operation == "+" )
operate = operand1 + operand2 ;
else if ( operation == "-" )
operate = operand1 - operand2 ;
else if ( operation == "*" )
operate = operand1 * operand2 ;
else if ( operation == "/" )
operate = operand1 / operand2 ;
field.setText ( Double.toString ( operate ) ) ;
} // end of method actionPerformed
public void clear ()
string = " ";
field.setText ( string ) ;
} // end of method clear
} // end of class
the old code which have the problem ( which i make the changes on ) :
// button clear
else if ( event.getSource()== clear )
string = "";
field.setText ( string ) ;
// button add
else if ( event.getSource()== add )
string = string + "+" ;
field.setText ( string ) ;
// button sub
else if ( event.getSource()== sub )
string = string + "-" ;
field.setText ( string ) ;
// button multip
else if ( event.getSource()== multip )
string = string + "*" ;
field.setText ( string ) ;
// button division
else if ( event.getSource()== division )
string = string + "/" ;
field.setText ( string ) ;
// button equal
else // if ( event.getSource()== equal )
operate = Double.parseDouble ( string ) ;
field.setText ( Double.toString ( operate ) ) ;
thanks a lot :)Open Java console and press "x" (Clear cache)
Disable caching in java paremeters. -
Class not found. Or: THERE'S NO SUCH THING AS APPLETS
Okay, the problem I�m having seems to be somewhat widespread judging from the forum achieves, but I wasn�t able to find any answers that worked for me. So forgive me if I�m treading old ground, but asking explicitly is my one last attempt to learn what�s going on.
The problem is the �load: class <someclass.class> not found� gray screen whenever I try to view an applet. Now, looking around online, there are a few applets that I�ve been able to access, and many I haven�t; I�m not certain what causes some to work fine and others to gray screen, but there doesn�t seem to be a pattern to it other than the fact that if I can or can�t view one applet at a site, the same is generally true for all the other applets there as well.
Now, as for local applets on my computer, I can�t view any of them. Not examples that come with the SDK, none that I�ve compiled myself, and none that I�ve downloaded. Needless to say, in my exasperation I�ve run through every possible permutation of html code for class and classpath and so on trying to modify code into working, but to no avail.
Now, in the appletviewer, and in an IDE called RealJ, I can run applets just fine. It�s just those embedded in web pages that seem to give me trouble.
I�ve uninstalled and reinstalled j2sdk 1.4.1. I�m running IE 6.0. Windows 98SE. In my Internet options, I have under Java (Sun) the �Use Java 2 v1.4.1 for applet� box checked, and under Java VM the �Java console enabled� and �JIT Compiler� boxes checked, though I have also gone through every permutation possible here, again, to no avail.
Any idea what I can change so that I can start running applets with ease?
Thanks in advance, I desperately appreciate whatever suggestions you can give.
Travisgray screen whenever I try to view an applet.
Now, looking around online, there are a few applets
that I�ve been able to access, and many I haven�t; Basically it is partly your browser and partly the version of the jdk /sdk that you are viewing. Generally, IE does not support swing ie JApplet, JButton, JTextArea etc... which is a shame cos it has some pretty neat features - I particularly like the flexibility with textfields and textAreas - and my favourite: imageIcon, allows you to have the sexiest looking buttons in the known universe. For reasons like this, people who like to write Applets like to use swing ... and people who like Sun don't like windoze and IE and the like (and they definitely hate each other). So, if you change your browser to Netscape or Opera - you will see swinging applets galore.
Shame really on a practical level, as the last survey I saw gave IE a 85 - 90 % share of the browser market. A bigger shame, when it seems to be deliberate that m-$oft do not include the latest JVM in their browser, yet they have the latest Flash plug-in. Both are in fact a good idea.
Any idea what I can change so that I can start running
applets with ease? Don't use swing and get a copy of something like jdk1.1.5 or even 1.1.2, if it compiles OK with this then it should be OK, keep it simple - as applets download on the client-side and can be unreliable and erratic so try and avoid images. Generally though Applets are a little bit out of vogue at the moment. -
Adding a JList to a JScrollPane
Searching through the archives, this appears to be a pretty frequent question, but so far, none of the answers have worked for me. Behold, what I have:
Filelist = new JList(Filelistmodel);
FilePane = new JScrollPane();
FilePane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
FilePane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
FilePane.setMaximumSize(new Dimension(650,150));
FilePane.setMinimumSize(new Dimension(650,150));
FilePane.setPreferredSize(new Dimension(650,150));
FilePane.setBounds(150, 0, 650, 150);
FilePane.setViewportView(Filelist);
panel.add(FilePane); Message was edited by:
break_the_chainOk, here's the context. It's not exactly simple, but it should compile and the rest of the code is more or less outside of the problem.
package formshow;
//import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.io.*;
import java.util.*;
public class Sync extends JApplet
JButton bttn1;
JComboBox Cbox_drives, Cbox_folders;
JPanel panel;
JFrame aframe;
JScrollPane FilePane;
DefaultListModel Filelistmodel;
JList Filelist;
class OnlyPRE implements FilenameFilter
Vector PRE;
public OnlyPRE(Vector PRE)
{this.PRE = PRE;}
public boolean accept(File dir, String name)
boolean accept = false;
for (int i=0; i<PRE.size(); i++)
if (name.startsWith((String)PRE.get(i)))
accept = true;
return accept;
public void init()
//applet listener
this.addFocusListener( new FocusListener()
public void focusGained(FocusEvent evt)
getContentPane().invalidate();
getContentPane().validate();
public void focusLost(FocusEvent evt)
getContentPane().invalidate();
getContentPane().validate();
//this applet
this.setSize(800,150);
//jpanel
panel = new JPanel(null);
//Button init stuff
bttn1 = new JButton("Get Files");
bttn1.setSize(150,50);
bttn1.setLocation(0,100);
bttn1.addActionListener( new ActionListener()
public void actionPerformed(ActionEvent evt)
{PopList();}
panel.add(bttn1);
//Cbox_drives init stuff
int offset = 'a';
Cbox_drives = new JComboBox();
for (int i=0; i<26; i++)
Cbox_drives.addItem((char)(offset+i)+":\\");
Cbox_drives.setSize(150,50);
Cbox_drives.setLocation(0,0);
Cbox_drives.addActionListener( new ActionListener()
public void actionPerformed(ActionEvent evt)
try {
getPatFolders();
catch (Exception e)Cbox_drives.setBackground(Color.RED);}
panel.add(Cbox_drives);
//Cbox_folders init stuff
Cbox_folders = new JComboBox();
Cbox_folders.setLocation(0,50);
Cbox_folders.setSize(150,50);
Cbox_folders.addItem("Pick the drive letter you have mapped to 1416_a");
panel.add(Cbox_folders);
//Filelist init stuff
Filelist = new JList();
Filelist.setVisibleRowCount(5);
//FilePane init stuff
FilePane = new JScrollPane(Filelist);
FilePane.setLocation(150,0);
FilePane.setSize(650,150);
panel.add(FilePane);
getContentPane().add(panel);
private int getPatFolders () throws Exception
String drive = (String) Cbox_drives.getSelectedItem();
String files[];
Vector prelist = new Vector();
prelist.addElement("PAT");
prelist.addElement("REL");
prelist.addElement("EME");
FilenameFilter onlyget = new OnlyPRE(prelist);
Cbox_folders.removeAllItems();
try{
File rootFolder = new File(drive);
files = rootFolder.list();
catch (Exception E)
files = new String[]{"Error Here"};
for (int i=0; i<files.length; i++)
Cbox_folders.addItem((String)files);
return (1);
private int PopList()
File StartFolder = new File(((String)Cbox_drives.getSelectedItem())+
(String)Cbox_folders.getSelectedItem()));
PopList(getFiles(StartFolder));
Filelist.removeAll();
Filelist = new JList(Filelistmodel);
FilePane = new JScrollPane();
FilePane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
FilePane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
FilePane.setMaximumSize(new Dimension(650,150));
FilePane.setMinimumSize(new Dimension(650,150));
FilePane.setPreferredSize(new Dimension(650,150));
FilePane.setBounds(150, 0, 650, 150);
FilePane.setViewportView(Filelist);
panel.add(FilePane);
getContentPane().invalidate();
getContentPane().validate();
return(1);
private int PopList(Vector transmute)
Filelistmodel = new DefaultListModel();
for (int i=0; i<transmute.size(); i++)
Filelistmodel.addElement(transmute.elementAt(i));
return(1);
private Vector getFiles(File ThisPath)
Vector ThisLevel = new Vector();
String FileList[] = ThisPath.list();
for (int i=0; i<FileList.length; i++)
File afile = new File(ThisPath.getAbsolutePath()+"\\"+FileList[i]);
if (afile.isFile())
ThisLevel.addElement(afile.getAbsolutePath());
else
append(ThisLevel,getFiles(afile));
return ThisLevel;
private Vector append(Vector Left, Vector Right)
for (int i=0; i<Right.size();i++)
Left.addElement(Right.get(i));
return Left;
Ok, basically this is for windows users. Pick a drive letter, then pick a folder from the next combo box.
Hit the button and a list of all of the files in the folders and subfolders shows up in the JList on the right.
DO NOT try this when the second list box is pointing to something like windows or program files.
I'd recommend creating your own folder that goes maybe one or two levels deep with just a bunch of empty text files.
I will <3 anyone that can help me with this forever and bestow upon them rediculous numbers of dukestars.
Message was edited by:
break_the_chain -
Signed Applet can't read an image file??
Hi my dear java folks,
I've written a simple applet and self-signed it in order to have access
to local machine's files.
The applet as you see needs to read an image file (arrow.gif).
The applet is:
import.....
public class MyApplet extends JApplet{
JButton button1=new JButton("Save");
JButton button2=new JButton(new ImageIcon("arrow.gif"));
public void init(){
button1.setBounds(10,70,80,20);
button2.setBounds(10,100,80,20);
getContentPane().setLayout(null);
getContentPane().add(button1);
getContentPane().add(button2);
The java.policy file is:
keystore ".//myworkingstore.store";
grant codeBase "http://fin2000/htdocs/MyApplet.class" {
permission java.io.FilePermission "<<ALL FILES>>","read";
permission java.io.AllPermission;
grant codeBase "." signedBy "MyName" {
permission java.io.FilePermission "${user.home}/*.*","read,write";
permission java.io.FilePermission "<<ALL FILES>>","read";
permission java.io.AllPermission;
The java.security file is on the server
(on my server I have Oracle8.1/Apache installed):
policy.url.1=file:d:/oracle/ora81/apache/apache/htdocs/java.policy;
My problem is when I run my applet through a html file
"http://myServerName/test.html" in my browser, the applet
runs correctly except it's button2 (the iconized button), the
button comes without it's ImageIcon on it.
I receive no errors, no messages and no signs of error
I am completely confused!
Need Urgent Help
Thank you , JamanirHi,
this has nothing to do with a security problem.
Change you code as follow:
JButton button2 = new JButton(new ImageIcon(getClass().getResource("arrow.gif")) ;Pack arrow.gif in the same directory/package as MyApplet.class in the jar file and It should solve your problem...
The problem is that when you write new ImageIcon("arrow.gif"), it works locally as a standalone application, because "arrow.gif" is mapped to the current directory where you application is started from. This has no meaning when you works online with an applet. That's the reason why your graphic was not found.
getClass().getResource("arrow.gif") returns an URL pointing to a file "arrow.gif" located at the same location as the class. This always works either locally or online, other packed in a Jar file, or unpacked.
Yannick
Maybe you are looking for
-
No network on reboot - Connection Details for Adapter Blank/Empty
I've been dealing with this issue for over a week now, and while extensive Internet searches have found similar situations, none exactly matched my situation, and none of the suggested fixes had any positive effects. Here's my exact situation: 1.) Sy
-
Hi Folks, When I attach a jpg or pdf to a mail it shows as the whole document "pasted" into the mail. Anyone know how I get the file to just show as an icon and not as a mass of pasted in docs? Thanks, Pedro
-
Install Documentation for MSS 60.1.19
Does anyone know where I can find documentation with explicit instructions on installing MSS 60.1.19? If I go "Business Package for Manager Self-Service 60.1" in the SAP Library, it suggests that Note:642775 has instructions for installing business
-
i just read through Axis user doc, but all sample app it mention doesn't show how to use the <HEADER> tag inside soap request / response. 1 -- is <HEADER> tag not much a use when doing 1 - 1 host to host request /response? 2 -- <HEADER> is only usefu
-
When to use transactions IM44 and IM54
Hi Can someone explain to me the functionality of the following transactions: IM44 - Rollup of budget values IM54 - Investment Program Reorganisation Do you use as part of the IM month-end process? thanks Joe