round.java

一个多线程Applet

import java.applet.Applet;
import java.awt.Graphics;
public class round extends Applet implements Runnable
{int i,x,y,j=0;
round r=new round();
		Thread t=new Thread(r);
	void s()
	{
		t.start();
	}	
	public void paint(Graphics g)
	{
		
		for(i=0;i<100;i++)
				{
					x=60+(int)(j*Math.cos(i*2*Math.PI/100));
					y=70+(int)(j*Math.sin(i*2*Math.PI/100));
					g.drawString("*",x,y);
				}
				
	}
	public void run()
	{
		while(true)
		{
			j=j+1;
				if(j==50)
				{j=0;}
			repaint();
		}
	}
}