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      ½ÓÏÂÀ´ÊµÏÖpaint(Graphics g)º¯Êý£¬À´»æÖÆÒ»¸ö²ÊÉ«Ô²Çò£¬Õâ¸öº¯ÊýÖÐÒª×öµÄ¾ÍºÜ¼òµ¥ÁË£¬ÓÃÌض¨µÄÑÕÉ«¸²¸ÇÒ»¸öÒ»¶¨´óСµÄÔ²ÐÎÇøÓò
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import java.awt.*;
import java.applet.Applet;
import javax.swing.JApplet;
public class Circle extends JApplet implements Runnable{
int x;//Ô²ÐÄx×ø±ê Ϊx-r/2
int y;//Ô²ÐÄy×ø±ê Ϊy-r/2
int r;//°ë¾¶

private Image img;
private Graphics graph;
public void init(){
Dimension de = this.getSize();
x = de.height/2;
y = de.width/2;
r = 1;
};
public void start(){
//¶¨ÒåÒ»¸öÏß³Ì
Dimension de = this.getSize();
x = de.height/2;
y = de.width/2;
r = 1;
Thread animation = new Thread(this);
animation.start();
}
public void stop(){

}
public void destroy(){

}
public void run(){
Dimension de1 = this.getSize();
while(true){
r += 1;
if(r>(de1.height/2)||r>(de1.width/2)){
r = 1;;
}
repaint();
try
{
// ÔÝÍ£Ïß³Ì30ºÁÃë
Thread.sleep (30);
}
catch (InterruptedException ex)
{
}
}
}
public void paint (Graphics g) {
//ÉèÖÃÇòµÄÑÕÉ«
g.setColor (Color.PINK);
// ´Óx-r/2,y-r/2λÖô¦»­Ò»¸öʵÐĵÄÔ²
g.fillOval(x-r/2,y-r/2,r,r);
}
//Ë«»º³å»úÖÆ
public void update (Graphics g)
{
// ³õʼ»¯buffer
if (img == nul


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