// 11-2  通 過 接 口 實(shí) 現(xiàn) 線 程 體 。package Clock;import java.util.Calendar;import java.awt.Graphics;import java.lang.ThreadGroup;public class Clock extends java.applet.Applet implements Runnable{    Thread clockThread;    public void start(){        if(clockThread==null){            clockThread=new Thread(this,"Clock");            clockThread.start();        }    }    public void run(){            for(int i=0;i<5;i++){                System.out.println(i+"  runing  "+getName());                try{                clockThread.sleep(500);                }                catch(InterruptedException e){  }            }            System.out.println("done!"+getName());    }    public void repaint(Graphics g){        Date now=new Date();        g.drawString(now.getHours()+":"+now.getMinutes()+":"+now.getSeconds(),5,10);        //System.out.print(now.getHours()+":"+now.getMinutes()+":"+now.getSeconds());    }    public void stop(){        clockThread.stop();        clockThread=null;    }    public static void main(String a[])throws InterruptedException{        Thread t=new Thread();        System.out.println("t.isAlive()=  "+t.isAlive());        System.out.println("t.currentThread()=  "+t.currentThread());        System.out.println("t.getClass()=  "+t.getClass());        System.out.println("t.getName()=  "+t.getName());        System.out.println("t.getPriority()=  "+t.getPriority());        System.out.println("t.getContextClassLoader()=  "+t.getContextClassLoader());        System.out.println("t.interrupted()=  "+t.interrupted());        System.out.println("t.activeCount()=  "+t.activeCount());        System.out.println("t.isDaemon()=  "+t.isDaemon());        System.out.println("t.toString()=  "+t.toString());        System.out.println();        Clock c=new Clock();        c.start();    }}