Writing Swing Applets

Hi all,
I written a swing applet, and i was able to run it using appletviewer, but when i try to open the applet on a browser, it gives me "NoClassFoundError : javax/swing/JApplet" error,
Can anyone tell me what is wrong with my configuration?
Thanks in advance

You need to install the plug-in for your browser. Download the latest JRE from here:
http://java.sun.com/j2se/1.4/download.html

Similar Messages

Using Swing applet to write data to file on SERVER

Hello,
I'm in the process of writing an applet using Swing (SDK v1.4.2). Here's the deal. The JApplet calls a JPanel, which will be used by customers on my site to enter data. I'm adding a <Save> button to the "form" which is supposed to write data to a file on the server (in order to preserve the customer's preferences).
Please note that I am NOT attempting to write data to the customer's hard disk. That requires digital certificates, etc. which I am trying to avoid for now.
Instead, I am using the URL class to access the file:
URL page = new URL("http://www.whatever.com/mycustomers/preferences.txt")
I then use the URLConnection class to establish the connection:
URLConnection conn = this.page.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
conn.connect();
etc...
I've created a text file (preferences.txt) on my web site. Using the classes InputStreamReader, BufferedStreamReader, and StringBuffer, I can successfully read the file into a JOptionPane in my applet.
The problem comes when I try to write data TO this file. I know the file exists because the applet can read it. I've set the permissions on the file to 666. I've got all of the appropriate syntax within a try statment that catches an IOException. I also have JOptionPanes all over the place to let me know where the program is. I've tried different combinations of output streams like BufferedWriter, BufferedOutputStream, StringWriter, but the file does not get updated. When the applet runs, it does not throw any exceptions, not even when I change the URL from "HTTP://www.whatever.com/prefs.txt" to "HTTP:/www.whatever.com/prefs.txt" (only one slash on HTTP, shouldn't I get a MalformedURLException?)
I apologize for all the background, but I thought you might need it. The bottom line is:
1) Can an applet write to a file on a remote server (not local hard disk)?
2) If so, what (if any) caveats are there?
3) Is there a way to check for file existence or be able to create a new file?
4) I'm using the HTTP protocol - is there some restriction that prevents an applet from writing to a file using that protocol? If so, is there a workaround?
5) Assuming that creating/writing a file using the method I've described is possible, what would be the appropriate output streams to use? (Currently, I'm using OutputStreamWriter with BufferedWriter).
I've been struggling with this for a while. Any help/suggestions would be appreciated.
Thanks
P.S. I also posted this message on the Applet development forum, but I've received no response as of yet.

Http servers support PUT as a mechanism to upload data to a specified URL. Get on the other hand which is what most people are familiar with is how you retrieve that data. The basic URLConnection is an abstraction of the Http connection which can be used for GET and POST operations by default based on doInput(true|false).. If you which to use any of the http methods other than GET|POST you will have to cast the URLConnection to HttpURLConnection so you can gain access to the specific Http functionaility that could not be abstracted.
Since you are using a hosting service the chances are that you won't be able to use HTTP PUT on their server. Most servers do not support HTTP PUT without configuring them todo so. Now Apache allows localized config through the .htacess file. It might be possible (keep in mind I am not an apache expert) to configure a particular directory to allow HTTP PUT using this .htacess file it may not be possible. You will have to consult the Apache web server documentation for that answer.
But regardless you can use the HttpURLConnection and the PUT method to send data from your applet to the server. In fact that is the preferred way to do this. If you can not configure your web server to support that method then you will have to develop a Servlet to do it. A servlet has several methods such as doGet(), doPost(), and doPut(). You would override the doPut() method get the URI path create a file and a FileOutputStream to that file, get from the request the inputstream, possibly skip the http headers, and then write byte for byte the incoming data to your OutputStream until you reach the end at which point you would close the OutputStream and send an Http Response of some sort. Typically in HTTP it would be 200 OK plus some web content. You content can be empty so long as your applet recognizes that is what it should expect...
And away you go...

Swing Applets and javascript

I'm writing a swing applet to do some rich text editing, mainly bolding, italicizing, etc as well as support for special characters (greek letters, etc). Rather than using the HTMLEditor kit (which I've heard suspect things about), I am going through the document tree and creating a corresponding HTML version of the string (inserting HTML entities based on position in the document). I am planning on exposing these to the client via javascript, but I have run into some problems with document.applets.appletName.publicMethodName. I've gotten this to work on IE for the PC. I am aware that there are some issues with the Sun plug-in for Netscape on PC. An additional complication is that this needs to work on a Macintosh as well. Does anyone know if the MRJ plugin supports this behavior (for both IE and Netscape)? Is there a better way to go about doing this, rather than using javascript to expose the HTMLized version of the string? Thanks in advance.
Tim

You must to check if the mrj plug-in is the same version to the jre1.3, because the jre 1.3 supports the javascript events. other way is incorporate in your applet the javascript class, in the next web page you will find the js.jar http://www.mozilla.org/rhino/download/
if you have troubles write me to
[email protected]
good luck
Carlos Sanhueza
Santiago de Chile

Swing applets headache...

Hey there...
I've been writing an applet for a while now and it recently stopped working on the web... I use swing and therefore have the latest JRE installed and have converted the standard <applet>... tag using the converter.
The applet works fine in appletviewer, JBuilder->run, and using the html page I use on the web but opened from the hard drive. (c:\... instead of http://....)
I've gotten 2 different and odd results:
1) When I type in code="Hengol" it fails to find Hengol.class
2) When I type code="Hengol.class" it looks for and fails to find Hengol/class.class
I don't understand what's going on and why it suddenly stopped working. (It worked fine for over 2 months). The applet .class is in the same directory as the htm file, meaning that the codebase element has been left out, and no packages are used.
I've watched what happens with the java console and below you'll find the detailed outputs for case (1) and (2) if it helps. You can also look at the page itself @ http://216.78.148.69/492/main.htm (code="Hengol.class") and http://216.78.148.69/492/main2.htm (code="Hengol")
Anyway- any/all help would be much appreciated!
Thanks,
Olivier Vanderstraeten
------------------------------------------------(1)
Opening http://216.78.148.69/492/Hengol.class <-- correct path
Connecting http://216.78.148.69/492/Hengol.class with no proxy
Opening http://216.78.148.69/492/Hengol.class <-- correct path
Connecting http://216.78.148.69/492/Hengol.class with no proxy
load: class Hengol not found.
java.lang.ClassNotFoundException: java.net.SocketException: Connection reset by peer: JVM_recv in socket input stream read
------------------------------------------------(2)
Opening http://216.78.148.69/492/Hengol.class <-- correct path
Connecting http://216.78.148.69/492/Hengol.class with no proxy
Opening http://216.78.148.69/492/Hengol/class.class <--incorrect path
Connecting http://216.78.148.69/492/Hengol/class.class with no proxy
load: class Hengol.class not found.
java.lang.ClassNotFoundException: java.io.FileNotFoundException: http://216.78.148.69/492/Hengol/class.class

Hi Olivier,
I think you should check your archive to make sure it contains the classes you need and also check the case of all paths and names you entered.
Here is an example for putting an applet into a web page (tested with IE5.x and NN 4.x)
SCRIPT LANGUAGE="JavaScript"

/SCRIPT
(I removed the brackets from the javascript statements so that I won't harm this forum)
Good Luck !
Alex.

Swing applets how?

I have no probs writing Swing Applications or AWT applets
but I dont know how to have a swing applet
I think you can install a plug in to IE so it can view Java 1.3. I am not too keen on this idea as it still means that people without the plug in will not be able to view the swing applet.
How do people without the plugin view the swing applet?
Simon

I am not too keen on this idea as it still means that
people without the plug in will not be able to view the
swing applet.That's just too bad... Didn't you know that M$ is dropping built-in "support" for Java altogether, so that you will need to download the ultra-modern plugin just like you need a plugin for movie clips, flash animations, sound, virtual reality, and other cool things?
There's more: the JRE is installed with the plugin so that the poor users will be able to run also other Java programs, not just applets. The whole world(*) will get a proper runtime environment! No more of these "how do I compile a .java to .exe" questions!
How do people without the plugin view the swing applet?Simple: convert the HTML code with the HTMLConverter app so that it will use the plugin. If a user that doesn't yet have the plugin enters your page he/she will be advised to download one...
(*) The whole world, or 'everywhere' in "write once, run everywhere" doesn't seem to incude *BSD? When will this be fixed???

Unable to download images in a swing applet (1.3.1) behind proxy

Hi
One of my client have a proxy server and firewall and when they try to access my webserver
then all the AWT applet are downloaded and rendered on client properly. However, the swing applet written
using JDK 1.3.1 is downloaded and rendered but it doesn't display anything properly as images
are not down loaded. I have used media tracker to add images to it like oMediaTracker.addImage( oImage, index );
and then oMediaTracker.waitForAll();
Java console display at client looks as follows:
Java(TM) Plug-in: Version 1.3.1
Using JRE version 1.3.1 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\toy
Proxy Configuration: no proxy
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
q: hide console
s: dump system properties
t: dump thread list
x: clear classloader cache
0-5: set trace level to <n>
Applet Initialization start...
Applet Image Initialization start...
Trace level set to 5: basic, net, security, ext, liveconnect ... completed.
Opening      http:MyServer/24/x.gif
Connecting     http:MyServer/24/x.gif with no proxy
Connecting
http:MyServer/24/x.gif with cookie "ASPSESSIONIDGQGQQVWC=DLNBDAOABFANEPJFFIGOOIPG;
JSESSIONID=25Ais2tF1eBkevUhAa2akocfShzNdzyL7yC1I7UhJl7Z6BLZrnQK!
-1149265879"
Opening      http:MyServer/40/y.gif
Connecting      http:MyServer/40/y.gif with no proxy
Connecting      http:MyServer/40/y.gif with cookie "ASPSESSIONIDGQGQQVWC=DLNBDAOABFANEPJFFIGOOIPG;
JSESSIONID=25Ais2tF1eBkevUhAa2akocfShzNdzyL7yC1I7UhJl7Z6BLZrnQK!
-1149265879"
Opening     http://MyServer/sun/beans/infos/PanelBeanInfo.class
Connecting     http://MyServer/sun/beans/infos/PanelBeanInfo.class with no proxy
Connecting http://MyServer/sun/beans/infos/PanelBeanInfo.class with cookie "ASPSESSIONIDGQGQQVWC=DLNBDAOABFANEPJFFIGOOIPG;
JSESSIONID=25Ais2tF1eBkevUhAa2akocfShzNdzyL7yC1I7UhJl7Z6BLZrnQK!
-1149265879"
Opening http://MyServer/java/awt/ContainerBeanInfo.class
Connecting http://MyServer/java/awt/ContainerBeanInfo.class with no proxy
Connecting http://MyServer/java/awt/ContainerBeanInfo.class
Client machine tries to access these images but i never receive a call at web server end when i see
IIS log.
CLient environment:
-Windows 2000/XP/NT
-Internet explorer 6.0 SP1 or IE 5.5 SP2
with connection->LAN Setting->Use Automatic configuration script(only checked)
-Java Plugin configured like proxies->Use Browser Setting
-JDK 1.3.1 plug in at client(downloaded and Installed automatically on demand)
-Object tag used to download applet and plugin
-Firewall and proxy(i don't know about vendor)
My webserver environment
Windows 2000/iis 5.0 with anonymous authentication and
cache-control header set to no-store (so that proxy doesn't cache anything)
QUESTIONS:
~~~~~~~~~
Q.1. When i try from home network that has a proxy then everything works fine. At client site everything except
image download works fine. I mean jars are downloaded and i can see anything drawn using JAVA API.
When i try from home i see following java console trace
Java(TM) Plug-in: Version 1.3.1
Using JRE version 1.3.1 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\wuko
Proxy Configuration: Automatic Proxy Configuration
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
q: hide console
s: dump system properties
t: dump thread list
x: clear classloader cache
0-5: set trace level to <n>
Trace level set to 5: basic, net, security, ext, liveconnect ... completed.
Applet Initialization start...
Applet Image Initialization start...
Opening http://MyServer/24/connec.gif
Connecting http://MyServer/24/connec.gif with proxy=197.168.1.100:808
Connecting http://MyServer/24/connec.gif with cookie "ASPSESSIONIDQQGQQCYU=GBJFAOABCJFPDMGFHEKLDACA; JSESSIONID=26yu5m1b4upVuXoAoDmtMbWXQmetQpyzqjFANszo9vFubujT4qGX!-1149265879"
Opening http://MyServer/24/cool.gif
Connecting http://MyServer/24/cool.gif with proxy=197.168.1.100:808
Connecting http://MyServer/24/cool.gif with cookie "ASPSESSIONIDQQGQQCYU=GBJFAOABCJFPDMGFHEKLDACA; JSESSIONID=26yu5m1b4upVuXoAoDmtMbWXQmetQpyzqjFANszo9vFubujT4qGX!-1149265879"
etc
I can't set the plugin at client to use automatic script just like IE browser uses. This option is not supported in JRE1.3.1. Looks to be supported in JRE1.4.1. My client doesn't want to set manual proxy ip and port in plugin as they don't want to reveal this info to everyone within the company for security reason.
Q.2. Why some classes like PanelBeanInfo.class, JAppletBeanInfo.class are downloaded
from my server while it doesn't exist at my webserver. Any thing stupid IE or plugin doing
at client. Any Idea?
Thanks in advance for any help.
Ratan

Thanks to Mike and other friends who already replied on this topic.
Here is my research analysis:
Answer to Question 1:
~~~~~~~~~~~~~~~~~~~~~
The solution is to bundle all the images with JAR. Bundle with jar whichever needs it. However, it might require duplicacy.
Image img = null;
try
img = Toolkit.getDefaultToolkit().getImage(getClass().getResource(fileName));
catch (Exception e) { }
In this case make sure that you have image at the same location where you access it. For example if you have to access an image in package class com.awt.ui.MyClass then your image should also be at location ..\com\awt\ui
Note: It will require image duplicacy in your JAR but it solves the problem. It gives the advantage of fewer download from server.
Answer to Question 2:
~~~~~~~~~~~~~~~~~~~~~
IE treats applet as an active-X and try to look for these classes in your JAR. SUN has stopped its support in JDK1.3.1 and plus. What one can do is to create dummy classes with these names and bundle it with your JAR. You have to create these dummy classes if you enable Basic authentication on your web server then browser will try to look for these classes on the server and continue to prompt you for login and password. It might bother your customer un-necessarily to enter login and password too many times prompted by plug-in (plug in).
--Ratan

How to run swing applets in a browser??

I understand it is a typical question and there lot of articles on it. I tried but am confused. I installed JRE1.3 which has java plug-in along with it which supports swing applets in a browser.Once i got that plug in i also downloaded html converter but am confused how should i run my swing applet.Can anyone please explain in simple steps as to how to achieve this objective..Thanks much in advance..an example would be of real big help
Thanks

The below links will help you.
http://java.sun.com/products/plugin//1.3/docs/index.docs.html
http://java.sun.com/products/plugin/1.3/plugin.faq.html

Best IDE and how-to create HTML for a swing Applet

Can you help me out? I've been using, and teaching with the old Symantec VisualCafe product from long, long, ago. It still works fine & I can even use it to build JFC/Swing Applets etc. But a few things have occurred. For one, a way back, Symantec sold VisualCafe to WEBGAIN - who now has gone out of business and sold it to a company called TOGETHERSOFT - who doesn't support it any longer.
This isn't really a big deal to me, because I can still build and deploy applets that are pre-swing easily enough. (as can my students)
HOWEVER... I'd like to be running with the LATEST Java (I think it's 1.4.01) and I'd LIKE to use whatever is the best development environment I can use - especially one I can recommend to my students. Do you know what that should be?
What's more, I'd still like to take some JFC/Swing created applets (even if compiled with the older VisualCafe IDE) and generate the HTML to allow 1.4 enabled browsers to run them (this is the case for the schools versions of Explorer and Netscape). Now, the HTML I have INSTALLED for the students used the HTML converter - back in 1.2 to produce the HTML at the bottom of this. This code no longer works now with current browsers. Do you know HOW one makes a jfc/swing compiled applet run on the latest browsers?
Any help or direction you can give would be appreciated.
thanks,
Bobby Berns
[email protected]
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
WIDTH = 756 HEIGHT = 396 codebase="http://java.sun.com/products/plugin/1.2/jinstall-12-win32.cab#Version=1,2,0,0">
<PARAM NAME = CODE VALUE = "lottery.class" >
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.2">
<COMMENT>
<EMBED type="application/x-java-applet;version=1.2" java_CODE = "lottery.class" WIDTH = 756 HEIGHT = 396 pluginspage="http://java.sun.com/products/plugin/1.2/plugin-install.html"><NOEMBED></COMMENT>
</NOEMBED></EMBED>
</OBJECT>



Bobby,
It's been a while since I've used the HTML Converter, but if I had to guess I'd say you need a newer version than what you have. Also, doesn't the converter allow you to choose which JDK you want to use (in which case you could select 1.4)? Again it's been a while so bear with me. Another option would be to put all the Swing classes into a .jar file (typically called swingall.jar) on your server and include that file as an attribute in your applet tag like this:
<APPLET CODE="yourApplet.class" ARCHIVE="swingall.jar">
This way you don't have to use the Java Plug-in, however the initial download time of the .jar file can be significant.
As for an IDE, I've always been happy using a text editor like UltraEdit. However, I've heard good things about Forte, and hey, it's free!
Regarding Christina's post, that solution will only work if the Applet does not use Swing components (and Bobby specifically said it does). By using the <OBJECT> and <EMBED> tags, rather than the <APPLET> tag, you force the browser to use the Java Plug-in (rather than the browser's default JVM).
Hope that helps,
- Sheepy

Java Swing Applets in Mac Os

hi there,
I am a student at the University of Portsmouth in the UK in my third and last year. I am doing my dissertation as a game using applets for a client at the university of which there consits four prototypes. One of the main specification points is that it should work on an apple mac, therefore I am using Swing applets. however with my first prototype it works fine on windows in windows Explorer, firefox and Netscape but i cant get it to work on Mac os 9 or X even with the latest version of java installed on the machine. Can anyone tell me why this is so, I would be very gratefull.
As I cant post the whole applet here as a file download I will just put some code snippets of the main program classes.
Applet ------------------------------
* Class JugglingBalls - A sub class of JApplet that combines the GameInterface and GamePanel into a single application
* @author (Liam Morren)
* @version (v1.0)
import java.awt.*;
import javax.swing.*;
public class JugglingBalls extends JApplet
    // instance variables -----------------------------------------------------------------------------------------------------------------------------------
    private GamePanel gamePanel; // The game panel including game and render loop
    private GameInterface gameInterface; // The swing interface to modify the game scene components
    // JApplet methods -------------------------------------------------------------------------------------------------------------------------------------
     * Called by the browser or applet viewer to inform this JApplet that it
     * has been loaded into the system. It is always called before the first
     * time that the start method is called.
    public void init()
        gamePanel = new GamePanel();
        gameInterface = new GameInterface(gamePanel.getGameScene());
        Container content = getContentPane(); // The container for components in the applet
        setLayout(new BoxLayout(content, BoxLayout.X_AXIS));
        content.add(gamePanel);
        content.add(gameInterface);
     * Returns information about this applet.
     * An applet should override this method to return a String containing
     * information about the author, version, and copyright of the JApplet.
     * @return a String representation of information about this JApplet
    public String getAppletInfo()
        // provide information about the applet
        return "Title: JugglingBalls \nAuthor: Liam Morren \nA simple application showing balls juggling in the air.";
Interface -------------------------------------
* Class GameInterface - Lets you manipulate the game components using swing components
* @author (Liam Morren)
* @version (v1.0)
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
public class GameInterface extends JPanel
    // instance variables -------------------------------------------------------------------------------------------------------------------------------------
    private GameScene gameScene; // Reference to the game scene
    private JTabbedPane gameTabs; // Tabs for Game, Balls and Background
    // Scene panel
    JButton pause, start, reset; // Buttons
    // Balls panel
    JRadioButton redBall, greenBall, blueBall, archBall, figureOfEightBall; // Radio buttons
    JCheckBox canSplit; // Check box
    JComboBox setAllPaths, setAllTypes, newBall, selectBall; // Drop down boxes
    JButton deleteBall; // Button
    Ball currentBall; // Current ball being changed
    // Background panel
    JRadioButton black, white, red, green, blue, hide, show, stop, move, arch, figureOfEight; // Radio buttons
    // Constructors -------------------------------------------------------------------------------------------------------------------------------------------
     * Constructor for objects of class GameInterface
    public GameInterface(GameScene gameSceneIn)
        gameScene = gameSceneIn; // Reference to the game scene
        gameTabs = new JTabbedPane(); // JTabbedPane to hold different toolbars
        gameTabs.setPreferredSize(new Dimension(200, 494)); // Set the preffered size for the tabbed pane
        currentBall = gameScene.getBall(0); // First ball
        // Add the panels to the tabbed pane
        gameTabs.addTab("Scene", makeScenePanel());
        gameTabs.addTab("Balls", makeBallsPanel());
        gameTabs.addTab("Background", makeBackgroundPanel());
        add(gameTabs); // Add the tab to the game interface panel
        setPreferredSize(new Dimension(200, 200));
    // Other methods ------------------------------------------------------------------------------------------------------------------------------------------
     * makeScenePanel
     * @return JPanel - The scene panel with buttons added
    private JPanel makeScenePanel()
        // Make scene panel
        JPanel scenePanel = new JPanel();
        scenePanel.setLayout(new BoxLayout(scenePanel, BoxLayout.Y_AXIS)); // Change layout
        pause = new JButton("Pause"); // Make buttons
        start = new JButton("Start");
        reset = new JButton("Reset");
        // Add button actions
        pause.addActionListener(new ActionListener() // Add button listener to pause button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                gameScene.setPaused(true); // Pause game
        start.addActionListener(new ActionListener() // Add button listener to start button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                gameScene.setPaused(false); // Unpause game
        reset.addActionListener(new ActionListener() // Add button listener to reset button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                gameScene.reset(); // Reset game
                updateSelectBallComboBox();
                changeSelectedBall(0);
        scenePanel.add(pause); // Add buttons to scene panel
        scenePanel.add(start);
        scenePanel.add(reset);
        return scenePanel;
     * makeBackgroundPanel
     * @return JPanel - The background panel with buttons added
    private JPanel makeBackgroundPanel()
        // Make scene panel
        JPanel backgroundPanel = new JPanel();
        backgroundPanel.setLayout(new GridLayout(5, 1, 2, 2)); // Change layout
        // Make buttons
        // background colour buttons
        JPanel backgroundcolour = new JPanel(); // Change backgroundcolour panel
        backgroundcolour.setBorder(BorderFactory.createLineBorder(Color.black));
        black = new JRadioButton("Black"); // Radio buttons to change colour
        white = new JRadioButton("white");
        black.setSelected(true); // Set black as already selected
        ButtonGroup backColourGroup = new ButtonGroup(); // Group buttons so only one can be pressed at a time
        backColourGroup.add(black); // Add buttons to group
        backColourGroup.add(white);
        backgroundcolour.setLayout(new GridLayout(2, 2, 0, 0)); // Change layout
        backgroundcolour.add(new JLabel("Background colour")); // Add label
        backgroundcolour.add(black); // Add buttons to colours panel
        backgroundcolour.add(white);
        // Add radio button actions
        black.addActionListener(new ActionListener() // Add button listener to black button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                gameScene.setBackgroundColour(false); // Background colour = black
        white.addActionListener(new ActionListener() // Add button listener to white button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                gameScene.setBackgroundColour(true); // Background colour = white
        // colour buttons
        JPanel colours = new JPanel(); // Change colours panel
        colours.setBorder(BorderFactory.createLineBorder(Color.black));
        red = new JRadioButton("Red"); // Radio buttons to change colour
        green = new JRadioButton("Green");
        green.setSelected(true); // Set green as already selected
        blue = new JRadioButton("Blue");
        ButtonGroup colourGroup = new ButtonGroup(); // Group buttons so only one can be pressed at a time
        colourGroup.add(red); // Add buttons to group
        colourGroup.add(green);
        colourGroup.add(blue);
        colours.setLayout(new GridLayout(2, 2, 0, 0)); // Change layout
        colours.add(new JLabel("Change colours")); // Add label
        colours.add(red); // Add buttons to colours panel
        colours.add(green);
        colours.add(blue);
        // Add radio button actions
        red.addActionListener(new ActionListener() // Add button listener to red button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                if (gameScene.getBackgroundEffect().getColour() != 0)
                    gameScene.getBackgroundEffect().setColour(0); // Background effect colour = red
        green.addActionListener(new ActionListener() // Add button listener to green button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                if (gameScene.getBackgroundEffect().getColour() != 1)
                    gameScene.getBackgroundEffect().setColour(1); // Background effect colour = green
        blue.addActionListener(new ActionListener() // Add button listener to blue button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                if (gameScene.getBackgroundEffect().getColour() != 2)
                    gameScene.getBackgroundEffect().setColour(2); // Background effect colour = blue
        // hide buttons
        JPanel hideShow = new JPanel(); // Change hideShow panel
        hideShow.setBorder(BorderFactory.createLineBorder(Color.black));
        hide = new JRadioButton("Hide"); // Radio buttons to hide show
        show = new JRadioButton("Show");
        show.setSelected(true); // Set show as already selected
        ButtonGroup hideShowGroup = new ButtonGroup(); // Group buttons so only one can be pressed at a time
        hideShowGroup.add(hide); // Add buttons to group
        hideShowGroup.add(show);
        hideShow.setLayout(new GridLayout(2, 2, 0, 0)); // Change layout
        hideShow.add(new JLabel("Hide / Show")); // Add label
        hideShow.add(hide); // Add buttons to hideShow panel
        hideShow.add(show);
        // Add radio button actions
        hide.addActionListener(new ActionListener() // Add button listener to hide button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                    gameScene.getBackgroundEffect().hide(); // Hide
        show.addActionListener(new ActionListener() // Add button listener to show button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                    gameScene.getBackgroundEffect().unHide(); // Unhide
        // stopMove buttons
        JPanel stopMove = new JPanel(); // Change StopMove panel
        stopMove.setBorder(BorderFactory.createLineBorder(Color.black));
        stop = new JRadioButton("Stop"); // Radio buttons to stop move
        move = new JRadioButton("Move");
        stop.setSelected(true); // Set stop as already selected
        ButtonGroup stopMoveGroup = new ButtonGroup(); // Group buttons so only one can be pressed at a time
        stopMoveGroup.add(stop); // Add buttons to group
        stopMoveGroup.add(move);
        stopMove.setLayout(new GridLayout(2, 2, 0, 0)); // Change layout
        stopMove.add(new JLabel("Stop / Move")); // Add label
        stopMove.add(stop); // Add buttons to stopMove panel
        stopMove.add(move);
        // Add radio button actions
        stop.addActionListener(new ActionListener() // Add button listener to stop button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                    gameScene.getBackgroundEffect().setMove(false); // stop
        move.addActionListener(new ActionListener() // Add button listener to move button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                    gameScene.getBackgroundEffect().setMove(true); // move
        // changePath buttons
        JPanel changePath = new JPanel(); // Change changePath panel
        changePath.setBorder(BorderFactory.createLineBorder(Color.black));
        arch = new JRadioButton("Arch"); // Radio buttons to change path
        figureOfEight = new JRadioButton("Figure of eight");
        arch.setSelected(true); // Set stop as already selected
        ButtonGroup changePathGroup = new ButtonGroup(); // Group buttons so only one can be pressed at a time
        changePathGroup.add(arch); // Add buttons to group
        changePathGroup.add(figureOfEight);
        changePath.setLayout(new GridLayout(2, 2, 0, 0)); // Change layout
        changePath.add(new JLabel("Change Path")); // Add label
        changePath.add(arch); // Add buttons to changePath panel
        changePath.add(figureOfEight);
        // Add radio button actions
        arch.addActionListener(new ActionListener() // Add button listener to arch button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                    gameScene.getBackgroundEffect().setPath(new Arch()); // Arch
        figureOfEight.addActionListener(new ActionListener() // Add button listener to figureOfEight button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                    gameScene.getBackgroundEffect().setPath(new FigureOfEight()); // Figure of eight
        // Add components to background panel
        backgroundPanel.add(backgroundcolour);
        backgroundPanel.add(colours);
        backgroundPanel.add(hideShow);
        backgroundPanel.add(stopMove);
        backgroundPanel.add(changePath);
        return backgroundPanel;
     * makeBallsPanel
     * @return JPanel - The ball panel with buttons added
    private JPanel makeBallsPanel()
        // Make balls panel
        JPanel ballsPanel = new JPanel();
        ballsPanel.setLayout(new BoxLayout(ballsPanel, BoxLayout.Y_AXIS)); // Change layout
        // Make buttons
        // set all drop down boxes
        JPanel setAll = new JPanel(); // Set all panel
        setAll.setBorder(BorderFactory.createLineBorder(Color.black));
        String[] setAllPathsChoices = {"Arch", "Figure of eight"}; // Selections for set all paths
        setAllPaths = new JComboBox(setAllPathsChoices); // Add selections to combo box
        String[] setAllTypesChoices = {"Primary ball", "Pastel ball", "3D ball", "Image ball"}; // Selections for set all types
        setAllTypes = new JComboBox(setAllTypesChoices); // Add selections to combo box
        setAll.add(new JLabel("Set all paths")); // Add combo boxes to set all panel
        setAll.add(setAllPaths);
        setAll.add(new JLabel("Set all types"));
        setAll.add(setAllTypes);
        // Add combo box actions
        setAllPaths.addActionListener(new ActionListener() // Add selection listener to set all paths combo box
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                if (setAllPaths.getSelectedItem() == "Arch")
                    gameScene.setAllPathsArch();
                else
                    gameScene.setAllPathsFigureOfEight();
        setAllTypes.addActionListener(new ActionListener() // Add selection listener to set all types combo box
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                if (setAllTypes.getSelectedItem() == "Primary ball")
                    gameScene.setAllTypesPrimaryBall();
                else if (setAllTypes.getSelectedItem() == "Pastel ball")
                    gameScene.setAllTypesPastelBall();
                else if (setAllTypes.getSelectedItem() == "Image ball")
                    gameScene.setAllTypesImageBall();
                else
                    gameScene.setAllTypesBall3D();
        // new ball drop down box
        JPanel newBallPanel = new JPanel(); // new ball panel
        newBallPanel.setBorder(BorderFactory.createLineBorder(Color.black));
        String[] newType = {"Primary ball", "Pastel ball", "3D ball", "Image ball"}; // Selections for new ball
        newBall = new JComboBox(newType); // Add selections to combo box
        newBallPanel.add(new JLabel("New ball")); // Add combo boxes to new ball panel
        newBallPanel.add(newBall);
        // Add combo box actions
        newBall.addActionListener(new ActionListener() // Add selection listener to newBall combo box
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                String ballType = (String) newBall.getSelectedItem();
                if (ballType == "Primary ball")
                    gameScene.addBall(new PrimaryBall(gameScene));
                else if (ballType == "Pastel ball")
                    gameScene.addBall(new PastelBall(gameScene));
                else if (ballType == "Image ball")
                    gameScene.addBall(new ImageBall(gameScene));
                else
                    gameScene.addBall(new Ball3D(gameScene));
                updateSelectBallComboBox();
                changeSelectedBall(gameScene.getBalls().size() - 1); // Update interface to show new ball
        // selected ball panel
        JPanel selectedBallPanel = new JPanel(); // selected ball panel
        selectedBallPanel.setBorder(BorderFactory.createLineBorder(Color.black));
        // Select ball
        selectBall = new JComboBox(gameScene.getBallList()); // Add ball list to the select drop down box
        deleteBall = new JButton("DeleteBall"); // Delete button
        // Ball colour
        redBall = new JRadioButton("Red"); // Red choice
        redBall.setSelected(true); // Start as selected
        greenBall = new JRadioButton("Green"); // Green choice
        blueBall = new JRadioButton("Blue"); // Blue choice
        ButtonGroup ballColour = new ButtonGroup(); // So only one colour can be selected at a tim
        ballColour.add(redBall);
        ballColour.add(greenBall);
        ballColour.add(blueBall);
        // Path
        archBall = new JRadioButton("Arch"); // Arch path choice
        archBall.setSelected(true); // Start as selected
        figureOfEightBall = new JRadioButton("Figure of eight"); // Figure of eight path choice
        ButtonGroup ballPath = new ButtonGroup(); // So only one path can be selected at a tim
        ballPath.add(archBall);
        ballPath.add(figureOfEightBall);
        // Can split
        canSplit = new JCheckBox("Can split", false); // Initialy not selected
        selectedBallPanel.add(new JLabel("Select ball")); // Add components to selected ball panel
        selectedBallPanel.add(selectBall);
        selectedBallPanel.add(deleteBall);
        selectedBallPanel.add(new JLabel("Ball colour"));
        selectedBallPanel.add(redBall);
        selectedBallPanel.add(greenBall);
        selectedBallPanel.add(blueBall);
        selectedBallPanel.add(new JLabel("Path"));
        selectedBallPanel.add(archBall);
        selectedBallPanel.add(figureOfEightBall);
        selectedBallPanel.add(canSplit);
        // Add select ball drop down box action
        selectBall.addActionListener(new ActionListener() // Add selection listener to selectBall combo box
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                changeSelectedBall(selectBall.getSelectedIndex()); // Change the selected ball using the index from the select ball drop down box
        // Add delete button action
        deleteBall.addActionListener(new ActionListener() // Add selection listener to deleteBall button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                int tempIndex = selectBall.getSelectedIndex(); // Temp index
                if (gameScene.getBalls().size() > 1) // If there is more than 1 ball left
                    gameScene.removeBall(tempIndex); // Remove ball
                    updateSelectBallComboBox(); // Update with new ball list
                    changeSelectedBall(tempIndex - 1); // Update interface with new current selected ball
        // Add radio button colour actions
        redBall.addActionListener(new ActionListener() // Add button listener to redBall button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                if (currentBall.getColour() != 0)
                    currentBall.setColour(0); // currentBall colour = red
        greenBall.addActionListener(new ActionListener() // Add button listener to greenBall button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                if (currentBall.getColour() != 1)
                    currentBall.setColour(1); // currentBall colour = green
        blueBall.addActionListener(new ActionListener() // Add button listener to blueBall button
            public void actionPerformed(ActionEvent ev) // Background colour = blue
                if (currentBall.getColour() != 2)
                    currentBall.setColour(2); // currentBall colour = blue
        // Add path radio button actions
        archBall.addActionListener(new ActionListener() // Add button listener to arch button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                    currentBall.setPath(new Arch()); // Arch
        figureOfEightBall.addActionListener(new ActionListener() // Add button listener to figureOfEight button
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                    currentBall.setPath(new FigureOfEight()); // Figure of eight
        // Add can split check button actions
        canSplit.addActionListener(new ActionListener() // Add button listener to can split
            public void actionPerformed(ActionEvent ev) // Overide actionPerformed() method
                    currentBall.setCanGiveBirth(canSplit.isSelected()); // Ball can split if can split check button is selected
        // Add components to ball panel
        ballsPanel.add(setAll);
        ballsPanel.add(newBallPanel);
        ballsPanel.add(selectedBallPanel);
        return ballsPanel;
     * changeSelectedBall
     * @param ballIndexIn - The numbered index of the ball in the game scene list of balls. If less than 0 then equals 0. If more than ball list size then equals last ball
    public void changeSelectedBall(int ballIndexIn)
        if (ballIndexIn < 0) // Make sure index is within bounds
            ballIndexIn = 0;
        else if (ballIndexIn >= gameScene.getBalls().size())
            ballIndexIn = gameScene.getBalls().size() - 1; // Else put within bounds at either end
        currentBall.highlight(false); // Unhighlight current ball
        currentBall = gameScene.getBall(ballIndexIn); // Get new current ball
        currentBall.highlight(true); // Highlight new current ball
        // Update controls to new ball
        selectBall.setSelectedIndex(ballIndexIn);
        switch (currentBall.getColour()) // Update colour controls
            case 0: redBall.setSelected(true); break;
            case 1: greenBall.setSelected(true); break;
            default: blueBall.setSelected(true); break;
        if (currentBall.getPath() instanceof Arch) // If path is arch
            archBall.setSelected(true); // Update controls as arch
        else
            figureOfEightBall.setSelected(true); // Else figure of eight
        canSplit.setSelected(currentBall.canGiveBirth()); // Set if the ball can split or not
     * updateSelectBallComboBox
     * This method updates the combo box selection model with a new one made from the updated balls arraylist from the game scene
    public void updateSelectBallComboBox()
        DefaultComboBoxModel model = new DefaultComboBoxModel(gameScene.getBallList());
        selectBall.setModel(model);
}Kind regards
Liam morren

http://docs.info.apple.com/article.html?artnum=301073
This link states Mac OS X 10.4 now supports Java 5.0. It does mention nothing about Mac OS 9 or previous version of OS X. The problem you may be facing is that your Mac is running only 1.4.2 or less. The class files compiled for Java 5.0 can't run in non 5.0 versions of the Java Virtual Machine. Java 5.0 was a major release for the Java language and thus the change in numbering (though it took a little bit for this to change).
Anyway you should confirm what version of Java you have installed on your Mac.
At a command prompt:
java -version
The above URL states that the previous 1.4.2 Java version is not uninstalled, and this could still be the preferred version to use for Java applications even after installing Java 5.0.
The URL above states there is a utility to set your apps to use Java 5.0 as the perferred Java version. Who knows maybe this is all you need to do. I hope this is the case, then it probably is an easy fix, otherwise you may need to rewrite your app in Java 1.4.2 to get it to run on your version of Mac.

How to show a html page in a swing applet -- URGENT!!!

Hi All,
I'm trying to show a html page inside a swing applet... is it possible to do that?? if so is there any built-in classes available for that?? If anyone have some examples, plz help me with that....
Thanks,
Ragu

i havent tested.. but this should work. i am no expert on these either, just to give you an example.. :-)
JEditorPane ePane = new JEditorPane();
HTMLEditorKit html = new HTMLEditorKit();
ePane.setEditorKit(html);
HTMLDocument htmld = new HTMLDocument();
try{
URL url = new URL("http://hcs.harvard.edu/~undercon/");
InputStream ins = url.openStream();
ePane.setDocument(htmld);
html.read(ins,htmld, 0);
this.getContentPane().add(new JScrollPane(ePane),BorderLayout.CENTER);
catch(Exception e)
e.printStackTrace();
}

How to use Flash buttons/animation in a Swing/Applet?

Hello,
I want to use flash button as like as JButton that we use in Swing/ Applet. How can I do So?
Please help me.
Thanks-

[http://java.sun.com/docs/books/tutorial/uiswing/misc/timer.html]
Or maybe just...
import java.awt.*;
import java.net.*;
import javax.swing.*;
public class Blinky {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable(){
            public void run() {
                URL url = null;
                try {
                    url = new URL("http://www.gifanimations.com/GA/image/animations/bodyparts/eyes/eye-01.gif");
                } catch (MalformedURLException e) {
                    throw new RuntimeException(e);
                JFrame f = new JFrame("Blinky");
                f.getContentPane().add(new JButton(new ImageIcon(url)));
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.pack();
                f.setLocationRelativeTo(null);
                f.setVisible(true);
}

PDF document in a Swing Applet?

How can you display a PDF document in a Swing Applet?

I have implemented a document archiving solution that provides a Swing UI to search a database for available documents. All the documents in the archive are in the PDF format. To accomplish this I use an html frameset where a Swing applet is displayed in one frame and the PDF document is displayed in the lower frame. I use LiveConnect to have my javascript communicate with the applet. My applet calls a javascript function that causes the URL of the lower frame point to the PDF document. This works fine, but I would rather use an all Java UI instead of depending on the browser and javascript.
How can we get Adobe or Sun to address this need?

Swing applet view problem in IE

Hi,
I am new to Java and have to develop a web enabled tool where the servlets in my Solaris-Tomcat web server is manipulating with data in an oracle database. The client code is on Swing Applet, which is to be opened in Internet Explorer 5.5 from Windows NT platform.
In view of this, I have written a small swing applet and it is not opening in IE. I heard that I need to use HTML converter to run Swing applets in IE. But, Is it enough to download the HTML converter for Solaris and install it in the server and convert the html pages where <applet> tag is included? Or , do I need to install the HTML converter for windows to all the client machines?
Please help. This is very urgent.
Thanks in adance.

You can use this html code :
<html>
     <body>
          <OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" WIDTH = 695 HEIGHT = 525 codebase="http://java.sun.com/products/plugin/1.3/jinstall-13-win32.cab#Version=1,3,0,0">
               <PARAM NAME = CODE VALUE = MyApplet >
               <PARAM NAME = CODEBASE VALUE = "." >
               <PARAM NAME = ARCHIVE VALUE = "MyApplet.jar" >
               <PARAM NAME="type" VALUE="application/x-java-applet;version=1.3">
               <PARAM NAME="scriptable" VALUE="false">
          </OBJECT>
     </body>
</html>
replacing only the dimension, the code value and removing or modifying archive value.
Don't modiy the classid. This code indicates to the browser to use the Sun Java VM instead of its own vm.
I hope this helps,
Denis

Using swing applet in IE

Dear,
Is there any way to use swing applet in IE.
Thanks,

If you are trying to make your code workable with Microsoft's VM, then I'd say you are looking for trouble. That VM's version is 1.1.4, if I'm not mistaken.
Better stick to the JRE 1.4 with the plugin.

Swing Applet on Mac OS 9

I have a Swing applet and I deployed it in weblogic 6.1, when I access this in Mac os 9 , it gives the Applet error : closing in browser.
Appart from installing MRJ2.2.5((latest?) and swingall.jar(jfc) ,
what are the other necessary steps to get the VM running properly in this environment.
But Apple's MRJ site states(http://developer.apple.com/java/download.html),
New features introduced since MRJ 2.2 include:
Full JFC Swing Support.
Can a Mac expert out there give me an answer to whether or not a Mac OS 9 user can run an applet that uses Swing components.
Please help.
Thanks
Vinod

As per my knowledge, u can use JJEdit editor on MAC OS X. By using this editor, you can run the applets. Here I am using JJEdit as a java editor on MAC OS X. just dowload the JJEdit. and run the applet on it.
regards
nr konjeti

Writing Swing Applets

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