threadtest2.java

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import java.awt.*;
import javax.swing.*;
public class ThreadTest2 extends JFrame implements Runnable 
{   //实现Runnable接口
    private Thread thread1, thread2;    //声明线程对象       
    private int x1 = 0;
    private int y1 = 0;
    private int x2 = 0;
    private int y2 = 0;
    private int t1 = 0;
    private int t2 = 0;
    
    public ThreadTest2()
    {
    	super("多线程");
			setSize(400,500);
			setBackground(Color.WHITE);            //设置背景色
		
			//创建两个线程
			thread1 = new Thread(this);        
			thread2 = new Thread(this);
		
			//启动两个线程
			thread1.start();
			thread2.start();
					
			setVisible(true);
			setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    
    public void paint(Graphics g)
    {
    	Graphics2D comp2D = (Graphics2D)g;
        
        //填充圆形
        comp2D.setColor(Color.BLUE);
        comp2D.fillOval(x1, y1, 30, 30);
        
        //填充圆形
        comp2D.setColor(Color.GREEN);
        comp2D.fillOval(x2, y2, 30, 30);
    	
    }
    
    public void run()
    { //实现Runnable接口的方法run()
    	while(true){
    		//如果当前线程为thread1则执行以下代码
    		if(Thread.currentThread() == thread1)
    		{
    			t1++;
    			x1 = 50 + 20 * t1;
    			y1 = 50 + (int)(1.0/2.0 * 9.8 * Math.pow(t1, 2));
    		    if(y1 >= 450)
    		    	t1 = 0;
    			repaint();
    			//线程thread1休眠100毫秒
    			pause(200);
    			//如果当前线程为thread2则执行以下代码
    		} 
    		else if(Thread.currentThread() == thread2)
    		{
    			t2++;
    			x2 = 300;
    			y2 = 50 + (int)(1.0/2.0 * 9.8 * Math.pow(t2, 2));
    			if(y2 >= 450)
    				t2 = 0;
    			repaint();
    			//线程thread2休眠120毫秒
    			pause(200);
    		}
    	}
    }
   
    private void pause(int time)   //设定线程休眠时间
    {
        try 
        {
            Thread.sleep(time);
        } catch (InterruptedException e) {}
    }
    
	public static void main(String[] args) 
	{
		ThreadTest2 test = new ThreadTest2();
	}
}