加载了一个图片,怎样让他响应键盘上的方向键移动呢?代码越精简越好!有会的都教下,谢谢!

我写了断代码,可是完全不响应,就把他删掉了,现在在重写,谁能不能帮我写断完整的啊,让我参考下!

import java.awt.*;
import java.awt.event.*;
import *;
import java.util.*;
import java.awt.image.*;
import javax.swing.*;
public class MoveCar extends JFrame {
    Toolkit tkit;
    Image img;
    int x,y;
    public MoveCar(String title)
    {
        super(title);
    tkit=getToolkit();
         try{
             Class c1=this.getClass();
             URL url=c1.getResource("/images/Red_Car.gif");
             img=tkit.getImage(url);
             tkit.prepareImage(img, -1, -1, this);
             }catch(Exception e){
             System.out.println("URL错误");
             }
             this.addKeyListener(new KeyAdapter(){
                    public void keyPressed(KeyEvent arg0) {
                        int imgX = (int) img.getLocation().getX();
                        int imgY = (int) img.getLocation().getY();
                        switch (arg0.getKeyCode()) {
                            case KeyEvent.VK_UP:
                                img.setLocation((int) (imgX),(int) (imgY-5));
                                break;
                            case KeyEvent.VK_DOWN:
                                img.setLocation((int) (imgX),(int) (imgY+5));
                                break;
                            case KeyEvent.VK_LEFT:
                                img.setLocation((int) (imgX-5),(int) (imgY));
                                break;
                            case KeyEvent.VK_RIGHT:
                                img.setLocation((int) (imgX+5),(int) (imgY));
                                break;
                            default:
                                break;
                        }   
                    }
                });

    }
    public static void main(String[] args)
    {
        MoveCar car=new MoveCar("移动图标");
        car.setSize(200,200);
        car.setVisible(true);
    }
    public void paint(Graphics g)
    {
      g.drawImage(img,50,80,this);     
    }
 }
只能写成这样了,好多方法还不会使用,那些方法,使用也有错,高手帮忙改下~,谢谢

谢谢,我会认真看的!