java图形绘制

图形移动闪屏问题

实现矩形在图面上移动；

代码详解：

package hgf;import java.awt.*;import java.awt.image.BufferedImage;import javax.swing.*;public  class demo1 extends JFrame{    private int x=100;    private int y=100;    Rectangle r1=new Rectangle(x,y,50,50);public void loop(){    while(true){        r1.x++;        r1.y++;    repaint();    for(int i=0;i<9999;i++){}  }}//绘制图形，并实现双缓冲public void paint(Graphics g){//缓冲图片    BufferedImage image=(BufferedImage)createImage(getWidth(),getHeight());//获取缓冲图片画笔    Graphics res=image.getGraphics();//在缓冲画板上绘制图形    res.setColor(Color.yellow);    res.fill3DRect(r1.x, r1.y, r1.width, r1.height,true);//在画板上绘制缓冲图片    g.drawImage(image, 0,0, null);}public demo1(){    setTitle("move");    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    setVisible(true);    setSize(600,600);    loop();}//main方法public static void main(String[] args) throws Exception {    new demo1();   }  }