将applet放入Frame时实现AppletStub接口的正确方法是什么？

Question

我创建了一个显示图片的applet，并希望将该applet加载到Frame中。我一直无法弄清楚（或在网上找到）实现AppletStub接口的正确方法，因此使用Frame并访问applet的getDocumentBase（）和getCodeBase（）方法。任何帮助将不胜感激。以下是三个类：＆＃34; MyGame＆＃34;小程序，框架I尝试将applet放入，以及AppletStub接口。我认为问题在于AppletStub接口的方法，它返回applet的getDocumentBase和getCodeBase，但我不完全确定。感谢任何能提供帮助的人。

public class MyGame extends Applet implements ActionListener, Runnable, AppletContext, AppletStub {
    Button b1=new Button("HELLO");
    int x, y = 0;
    private Image i;       // this is for double buffering
    boolean changeColor=false;
    URL url;
    private Graphics doubleG;
    Image car;


    public void init(){
        setSize(700,700);
        setBackground(Color.BLACK);
        b1.addActionListener(this);
        //add(b1);

        try{
            url=getDocumentBase();  
        }catch(Exception e){

        }car=getImage(url, "Resources/sprite.png");

    }

    public void start(){
        Thread mg = new Thread(this);
        mg.start();
    }

    public void update(Graphics g) //double buffering
    {//start update
        if(i == null)
        {
            i = createImage(this.getSize().width, this.getSize().height);
            doubleG=i.getGraphics();
        }
        doubleG.setColor(Color.black);
        doubleG.fillRect(0,  0, this.getSize().width, this.getSize().height);
        doubleG.setColor(Color.black);
        paint(doubleG);
        g.drawImage(i, 0, 0, this);

    }//end update

    public void paint(Graphics g){
        if(changeColor)
            setBackground(Color.RED);
        g.setColor(Color.white);
        g.drawString("HOLA", 10, 10);

        g.drawString("hi", 100, 100);

        g.fillRect(x,  y, 10, 10);

        g.drawImage(car, 100, 100, this);
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==b1){

            changeColor=true;


        }

        }
    @Override
    public void run() {
        while(true){
            x++;
            y++;
        repaint();
        try{
            Thread.sleep(20);
        } catch(InterruptedException e) {
            e.printStackTrace();
        }

    }
    }

    @Override
    public void appletResize(int arg0, int arg1) {
        // TODO Auto-generated method stub

    }

    @Override
    public Applet getApplet(String name) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Enumeration<Applet> getApplets() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public InputStream getStream(String key) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Iterator<String> getStreamKeys() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setStream(String key, InputStream stream) throws IOException {
        // TODO Auto-generated method stub

    }

    @Override
    public void showDocument(URL url) {
        // TODO Auto-generated method stub

    }

    @Override
    public void showDocument(URL url, String target) {
        // TODO Auto-generated method stub

    }
}

和

public class HelloAppSwing  {

    public static void main(String args[]) {
        final Applet applet = new MyGame();
        Frame frame = new Frame("AppletWithAppletStub");

        frame.addWindowListener(new WindowAdapter() {
          public void windowClosing(WindowEvent event) {
            applet.stop();
            applet.destroy();
            System.exit(0);
          }
        });

        frame.add("Center", applet);
        frame.setSize(700, 700);
        // setting AppletStub
        applet.setStub(new AppletStubInterface(args, applet));
        frame.setVisible(true);

        applet.init();
        applet.start();

        frame.pack();
      }
    }

        JFrame f = new JFrame();
        JPanel leftPanel=new JPanel();
        JPanel rightPanel=new JPanel();
        JPanel topPanel=new JPanel();
        JPanel bottomPanel=new JPanel();
        f.setLayout(new BorderLayout());
        MyGame myGame = new MyGame();


        myGame.init();
        myGame.start();
         f.setSize(900, 800);
        f.add(myGame, BorderLayout.CENTER);
        leftPanel.setBackground(Color.GRAY);
        rightPanel.setBackground(Color.GRAY);
        topPanel.setBackground(Color.GRAY);
        bottomPanel.setBackground(Color.GRAY);
        topPanel.setPreferredSize(new Dimension(900, 50));
        bottomPanel.setPreferredSize(new Dimension(900, 50));
        leftPanel.setPreferredSize(new Dimension(100, 800));
        rightPanel.setPreferredSize(new Dimension(100, 800));
        f.add(leftPanel, BorderLayout.LINE_START);
        f.add(rightPanel, BorderLayout.LINE_END);
        f.add(topPanel, BorderLayout.PAGE_START);
        f.add(bottomPanel, BorderLayout.PAGE_END);

        f.setVisible(true);
        f.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
}

和

public class AppletStubInterface implements AppletStub {
    private Hashtable<String, String> hashtable;
    private Applet applet;

    public AppletStubInterface(String args[], Applet a) {
        applet = a;
        hashtable = new Hashtable<String, String>();
            for (int i = 0; i < args.length; i++) {
                try {
                StringTokenizer parser = new StringTokenizer(args[i], "=");
                String name = parser.nextToken().toString();
                String value = parser.nextToken("\"").toString();
                value = value.substring(1);
                hashtable.put(name, value);
                } catch (NoSuchElementException e) {
            e.printStackTrace();
            }
        }
    }
    public void appletResize(int width, int height) {
    applet.resize(width, height);
    }
    public AppletContext getAppletContext() {
    return null;
    }

    public java.net.URL getCodeBase() {
        String host;
        if ((host = getParameter("host")) == null) {
        try {
        host = InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
        e.printStackTrace();
        }
        }
        java.net.URL url = null;
        try {
        url = new java.net.URL("file/" + host);
        } catch (Exception e) {
        }
    return url;
    }
    public java.net.URL getDocumentBase() {
    return getCodeBase();
    }
    public String getParameter(String param) {
    return (String) hashtable.get(param);
    }
    public boolean isActive() {
    return true;
    }
}