让坦克听从我们的指挥

[java]代码库
import java.awt.*;
import java.awt.event.*;
 
public class TankClient extends Frame {
     
    public static final int GAME_WIDTH=800;
    public static final int GAME_HEIGHT=600;
     
    int x = 50, y = 50;
     
    Image offScreenImage = null;
     
    public void paint(Graphics g) {
        Color c = g.getColor();
        g.setColor(Color.RED);
        g.fillOval(x, y, 30, 30);
        g.setColor(c);
         
    }
     
    public void update(Graphics g) {
        if(offScreenImage == null) {
            offScreenImage = this.createImage(GAME_WIDTH, GAME_WIDTH);
        }
        Graphics gOffScreen = offScreenImage.getGraphics();
        Color c = gOffScreen.getColor();
        gOffScreen.setColor(Color.GREEN);
        gOffScreen.fillRect(0, 0, GAME_WIDTH, GAME_WIDTH);
        gOffScreen.setColor(c);
        paint(gOffScreen);
        g.drawImage(offScreenImage, 0, 0, null);
    }
 
    public void lauchFrame() {
        this.setLocation(400, 300);
        this.setSize(GAME_WIDTH, GAME_WIDTH);
        this.setTitle("TankWar");
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        this.setResizable(false);
        this.setBackground(Color.GREEN);
         
        this.addKeyListener(new KeyMonitor());
         
        setVisible(true);       
        new Thread(new PaintThread()).start();
    }
 
    public static void main(String[] args) {
        TankClient tc = new TankClient();
        tc.lauchFrame();
    }
     
    private class PaintThread implements Runnable {
 
        public void run() {
            while(true) {
                repaint();
                try {
                    Thread.sleep(50);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
 
    private class KeyMonitor  extends KeyAdapter
    {
 
     
        public void keyPressed(KeyEvent e) {
 
            System.out.println("ok");
             
            int key=e.getKeyCode();
//          if(key==KeyEvent.VK_RIGHT)
//          {
//              x +=5;
//          }
             
            switch(key)
            {
            case KeyEvent.VK_LEFT:
                x-=5;
                break;
            case KeyEvent.VK_UP:
                y-=5;
                break;
            case KeyEvent.VK_RIGHT:
                x+=5;
                break;
            case KeyEvent.VK_DOWN:
                y+=5;
                break;
            }
        }
         
    }
 
}
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