//楼主如果满意的话，设置我为满意答案，我就差你一个就10个了import java.awt.*;

import java.awt.event.*;class ThreadRect extends Frame implements Runnable ,ActionListener

{

Thread rect;

Rect redRect;

Button bt1,bt2;

//int x,y;

Boolean run=false;

public ThreadRect()

{

super("control the ball");

setLayout(null);

rect=new Thread(this);

redRect=new Rect(Color.red);

bt1=new Button("start");

bt2=new Button("quit");

bt1.setBounds(180,260,80,40);

bt2.setBounds(240,260,40,40);

bt1.addActionListener(this);

bt2.addActionListener(this);

add(redRect);

add(bt1);

add(bt2);

setSize(300,300);

}

public void run()

{

while(true)

{

int x=50,y=50;

for(int i=1;i<10;i++)

{

if(run){

x+=20;y+=20;

System.out.println (x+" "+y);

redRect.setLocation(x,y);

try {

Thread.sleep(1000);

}

catch (Exception ex) {

ex.printStackTrace();

}//如果不加此行将只看到最后一个结果

}

else{

stop();

}

}

}

}

public void actionPerformed(ActionEvent e)

{

if(e.getActionCommand().equals("start")){

//System.out.println ("start");

bt1.setLabel("pause");

bt2.setLabel("quit");

//bt1.setActionCommand("pause");

//bt2.setActionCommand("stop");

run=true;

rect.start();

}

if(e.getActionCommand().equals("quit")){

System.exit(0);

}

if(e.getActionCommand().equals("pause")){

bt1.setLabel("continue");

run=false;

}

if(e.getActionCommand().equals("continue")){

bt1.setLabel("pause");

run=true;

renew();

}

}

public synchronized void stop()

{

try {

wait();

}

catch (Exception ex) {

ex.printStackTrace();

}

}

public synchronized void renew()

{

notifyAll();

}

}class Rect extends Canvas

{

Color color;

public Rect(Color color)

{

setBounds(50,50,30,30);

this.color=color;

}

public void paint(Graphics g)

{

g.setColor(Color.red);

g.fillRect(0,0,20,20);

}

}class ThreadTest

{

public static void main(String[] args)

{

ThreadBall tb=new ThreadBall();

tb.addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

tb.setVisible(true);

}

}

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