thread8.java

java关于线程的一些实例

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Thread8 extends Applet implements Runnable{
	Thread redBall,blueBall;
	Graphics redPen,bluePen;
	double t=0;
	public void init(){
		redBall=new Thread(this);
		blueBall=new Thread(this);
		redPen=getGraphics();
		bluePen=getGraphics();
		redPen.setColor(Color.red);
		bluePen.setColor(Color.blue);
		
	}
	public void start(){
		redBall.start();
		blueBall.start();
	}
	public void run(){
		while(true){
		t=t+0.2;
		if(Thread.currentThread()==redBall){
			if(t>20)t=0;
			redPen.clearRect(0,0,38,300);
			redPen.fillOval(20,(int)(1.0/2*t*t*3.8),16,16);
			try{
				redBall.sleep(50);
			}catch(InterruptedException e){}
		}
		else if(Thread.currentThread()==blueBall){
			bluePen.clearRect(38,0,500,300);
			bluePen.fillOval(38+(int)(16*t),(int)(1.0/1*t*t*3.8),16,16);
			try{
				blueBall.sleep(50);
			}catch(InterruptedException e){}
		}
	}
  }

}