Java获得键值以及关闭Java程序窗口的方法，按下按键获得该按键的键值！

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.*;


public class Get_keyCode{
 private static final String EXIT_ON_CLOSE = null;
   public static void main(String args[]) {
 
  Frame f=new Frame();
  f.setSize(300,400);
  MyPanel mp=new MyPanel();
  f.add(mp);
  f.addKeyListener(mp);
  mp.addKeyListener(mp);
       f.show();
       f.addWindowListener(new WindowAdapter(){
   public void windowClosing(WindowEvent e){
   System.exit(0);//退出
   }
   });//关闭打开窗口操作
  
   }
   }
   class MyPanel extends Panel implements KeyListener{
   @Override
   public void keyPressed(KeyEvent arg0) {
    // TODO Auto-generated method stub
   
    System.out.println("请按下你要输入的键");
    System.out.println(arg0.getKeyCode());


   }


   @Override
   public void keyReleased(KeyEvent arg0) {
    // TODO Auto-generated method stub
   
   }


   @Override
   public void keyTyped(KeyEvent arg0) {
    // TODO Auto-generated method stub
   
   }


   
   }