clock.java

java写的多线程应用

import java.awt.*;
import java.applet.*;
import java.util.Date;

public class Clock extends Applet implements Runnable
{
	Thread clockThread;
	Font font;
	public void init()
	{
		font=new Font ("TimesRoman",Font.BOLD,48);
	}
	public void start()
	{
		if(clockThread==null)
	 {   
          clockThread=new Thread(this,"Showtime");
          clockThread.start();
    }
    }
   public void run()
   {
       while(clockThread!=null)
         {
            repaint();
            try
             {
                  clockThread.sleep(1000);
              }catch (InterruptedException e){ }
          }
  }
    public void paint(Graphics g)
    {
    	Date now=new Date();
    	g.setFont( font);
    	g.setColor(Color.red);
    	g.drawString(now.getHours()+":"+now.getMinutes()+":"+now.getSeconds(),5,50);
    }
    public void stop()
    {
    	clockThread.stop();
    	
    }
  }