用java写了一个键盘监听，实现一张图片的上下左右移动，为什么图片会出现一闪一闪的，大神求解

package Fly;

import java.awt.Graphics;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Timer;
import java.util.TimerTask;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**

• 1.设置游戏窗口
• 2.
• @author q * */ public class OperateFly extends JFrame{ protected static int WIDTH=1000; protected static int HEIGHT=600; private Timer timer; private static int intervel=10; private Flyings flys=new Flyings(); public static BufferedImage fly1; public static BufferedImage background; public static BufferedImage begin_one; public static BufferedImage gameover; public static BufferedImage begin_two; public static BufferedImage begin_three;

static{
try{
fly1=ImageIO.read(new File("images/fyls1.png"));
background=ImageIO.read(new File("images/background.png"));
begin_one=ImageIO.read(new File("images/firstbegin.png"));
begin_two=ImageIO.read(new File("images/SecondBegin.png"));
begin_three=ImageIO.read(new File("images/ThreeBegin.png"));
}catch(Exception e){
e.printStackTrace();
}
}

public OperateFly(){
//窗口
JPanel panel=new JPanel();
this.setSize(WIDTH, HEIGHT);
this.add(panel);//将面板添加到窗口中
this.setAlwaysOnTop(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
this.setVisible(true);

this.addKeyListener(new KeyAdapter(){
    @Override
    public void keyPressed (KeyEvent e) {
            switch(e.getKeyCode()){
            //上移
            case KeyEvent.VK_W:
            case KeyEvent.VK_UP:
                System.out.println(e.getKeyCode());
                flys.moveup();
                break;
            //下移
            case KeyEvent.VK_S:
            case KeyEvent.VK_DOWN:
                flys.movedown();
                break;
            //左移
            case KeyEvent.VK_A:
            case KeyEvent.VK_LEFT:
                flys.moveleft();
                break;
            case KeyEvent.VK_D:
            case KeyEvent.VK_RIGHT:
                flys.moveright();
                break;
            default:
                System.out.println(e.getKeyCode());
            }   
    }
    @Override
    public void keyTyped(KeyEvent e) {
        // TODO Auto-generated method stub

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

}
/*

• 画图
  /
  public void paint(Graphics g){
  g.drawImage(background,0,0,WIDTH,HEIGHT,null);
  paintfly(g);
  }
  /画飞行器*/
  public void paintfly(Graphics g){
  g.drawImage(fly1,flys.getX(),flys.getY(),flys.getWidth(),flys.getHeight(),null);
  }
  public static void main(String[] args){

  JFrame frame=new JFrame("FLY");
  OperateFly operatefly=new OperateFly();
  operatefly.action();
  }
  public void action(){
  timer=new Timer();
  timer.schedule(new TimerTask(){

  @Override
  public void run() {
  
      repaint();       //重画
  
  }},intervel,intervel);
  

  }
  }

下面是Flyings类

package Fly;

import java.awt.image.BufferedImage;

import FlyingObject.FlyingsObject;

/*

• 飞行工具类
  */
  public class Flyings extends FlyingsObject{
  private static final int Speedx=2;
  private static final int Speedy=2;
  private int life;
  public Flyings(){
  image=OperateFly.fly1;
  life=3;
  width=600;
  height=400;
  x=598;
  y=356;
  }
  @Override
  public void moveup() {
  this.x=x;
  this.y-=Speedy;
  if(OutofBoundsY()){
  this.y=getY();
  }

  }
  @Override
  public void movedown() {
  this.x=x;
  this.y+=Speedy;
  if(OutofBoundsY()){
  this.y=getY();
  }
  }
  @Override
  public void moveleft() {
  this.x-=Speedx;
  this.y=y;
  if(OutofBoundsY()){
  this.x=getX();
  }
  }
  @Override
  public void moveright() {
  this.x+=Speedx;
  this.y=y;
  if(OutofBoundsY()){
  this.x=getX();
  }
  }
  /*上下越界判断*/
  public boolean OutofBoundsY(){
  return this.y>OperateFly.HEIGHT-getHeight()||this.y }
  /*左右越界判断*/
  public boolean OutofBoundsX(){
  return this.x>OperateFly.WIDTH-getWidth()||this.x<0;
  }
  }

图片的移动就会窗体重绘，怎么可能不闪，如果要不闪，要么用direct draw 2D,要么用矢量模型，比如flash，要么微软的slivelight

在repaint和paint之间的update中写入双缓冲，先在一个图片画完所有所有该画的，然后再把图片上所有内容copy到界面上，消除闪烁现象。可以参考我的坦克大战内容，里面也有消除闪烁现象坦克大战

用双缓冲技术可以解决闪烁问题，具体请看博文：http://blog.csdn.net/u013189927/article/details/51007304

我没写过图片类的监听，不过原理应该都是一样的。我想问下，全部源代码都是你自己写的吗？还是借鉴了别的什么？