给一个JPanel添加一个键盘事件！怎么添加（在线等）

[plane10598]

给一个JPanel添加一个键盘事件！怎么添加

[interpb]

public class MyFrame extends JFrame {
public static void main(String[] args) {
new MyFrame();
}

public MyFrame() {
super("hello");
this.setSize(300, 400);
this.setVisible(true);
this.setBounds(200,200,400,400);
JPanel jp = new JPanel();
jp.setSize(200,200);
jp.setBackground(Color.GREEN);
jp.addKeyListener(new KeyAdapter (){

public void keyPressed(KeyEvent ke) {

System.out.println("@@");
}
public void keykeyReleased(KeyEvent ke) {

System.out.println("@@");
}
});
jp.setFocusable(true);
this.getContentPane().add(jp);
}
}

[imA]

addKeyListener(KeyEvent event)