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  1. #1
    gladwda is offline Member
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    Oct 2011
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    Default application translate to an applet


    At the moment I'm learning to change an application into an applet in order to run it online.
    The issue I am having however is in learning how to do this. I have read through the how to make applets tutorial on oracle's site however I'm struggling with adapting it to my specific code due to the fact that I integrate JFrame as well as Canvas. It is as follows:

    Java Code:
    ***import stuff removed to save space***
    public class Game extends Canvas {
       private BufferStrategy buffage;
    ***private boolean/arraylists/ints initialised removed to save space***
    public Game() {
          JFrame theFrame = new JFrame("Name Goes Here");
          JPanel thePanel = (JPanel) theFrame.getContentPane();
          thePanel.setPreferredSize(new Dimension(800,600));
          theFrame.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent e) {
          addKeyListener(new KeyInputHandler());
          buffage = getBufferStrategy();
       private void startGame() {
    Now if I just change the Game class to Game extends Canvas, that throws out createBufferStrategy obviously as it derives from Canvas. Yet I need to implement JApplet.
    Someone told me that I "could still use a canvas with either just having 2 classes one that extends applet and 1 that extends canvas and use applet.add(canvas)", but everytime I try to work this out I hit a wall, I'm a newbie to coding and so I'm a bit panicky at how this should look. I'd have no problem if I had an example to work off, but I can't find a single piece of code anywhere where someone has had two classes, implementing Canvas in an Applet in this way. Perhaps I am blind.

    Could somebody please help me out? I'm really keen on learning! But it's been a bit of a brick wall the last few days trying to sort this out, I'm sure its simple but I can't get it unfortunately :/

    Thank you!

  2. #2
    Fubarable's Avatar
    Fubarable is offline Moderator
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    Default Re: application translate to an applet

    Please clarify: why are you mixing AWT (Canvas) and Swing (JFrame)? Why not one or the other (usually Swing)?

    Also, have you considered using Java Web Start instead?

  3. #3
    gladwda is offline Member
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    Default Re: application translate to an applet

    Well I need Canvas because of the getBufferStrategy, I'm only using JFrame to set up my window, key listener etc.
    It made sense in the application because I didn't have to extend anything else.

    Could I do without it in an Applet? Realising that I can define the dimensions in the html. If so does that present me with a new problem regardin the keyListener and so on?

    As for webstart, I didn't really want the user to have to launch the game, as some technophobes find it a bit intimidating I think, rather than launching inside the browser.

  4. #4
    gladwda is offline Member
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    Default Re: application translate to an applet

    If I drop JFrame entirely and go with this:

    public void init() {

    canvas = (Canvas)add(new Canvas());

    new Thread(this).start();

    That could work,
    only when I try to extend Applet it tells me that it cannot find the class?

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