java模拟时钟

package myThread;import java.applet.Applet;import java.awt.Graphics;import java.text.SimpleDateFormat;import java.util.Date;public class CalendarTest extends Applet implements Runnable{Thread clock;public void init(){if(clock==null){clock=new Thread(this,"clock");}clock.start();}public void run(){while(true){try{repaint();Thread.sleep(1000);}catch (InterruptedException e){e.printStackTrace();}}}public void paint(Graphics g){   Date date=new Date();   SimpleDateFormat sdf=new SimpleDateFormat("HH:mm:ss");   String time=sdf.format(date);   g.drawString(time, 90, 90);}public void stop(){clock=null;}}

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