[求助]关于Applet的键盘监听和响应

[joanna6868]

涉及到关于Applet的键盘监听和响应

程序中有一语句Alpha rotationAlpha=new Alpha(-1,Alpha.INCREASING_ENABLE,0,0,s,0,0,0,0,0);
其中有一变量s，我需要通过键盘按键来改变s值，以控制某些变化。
按VK_UP键使s=s-100
按VK_DOWN键s=s+100

我写的程序不起作用，请问应该怎么写？

[fengmingjie]

import javax.swing.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

public class TestKey extends JFrame {
public TestKey() {
MyPanel myPanel=new MyPanel();
this.getContentPane().add(myPanel);
setSize(300, 200);
setLocation(100, 100);
setVisible( true );
}

class TestKeyListener extends KeyAdapter{
public void keyPressed(KeyEvent event) {
System.out.println("===========================" + event.getKeyCode());
}

public void keyReleased(KeyEvent event){
System.out.println("W释放" + event.getKeyCode());
}

public void keyTyped(KeyEvent event){
if (event.getKeyCode() == KeyEvent.VK_K) {
System.out.println("按下一次 pressed and released");
}
}
}
class MyPanel extends JPanel{
public MyPanel(){
setFocusable(true);
addKeyListener(new TestKeyListener());
}
}
public static void main(String args[]) {
TestKey application = new TestKey();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}