class Demo implements Runnable
{
    public synchronized void run() {
           try{wait();}
           catch (InterruptedException e)
           {
               System.out.println(Thread.currentThread().getName()+"已經停止等待 丟擲異常");
           }
           for(int i=0;i<10;i++)
           System.out.println(Thread.currentThread()+"..."+i);
    }
}
public class Main {

    public static void main(String[] args)
    {

        Demo d1=new Demo();
        Demo d2=new Demo();
        Demo d3=new Demo();
        //預設的執行緒組是main
        ThreadGroup t=new ThreadGroup("執行緒組t");
        Thread t1=new Thread(t,d1);
        Thread t2=new Thread(t,d2);
        Thread t3=new Thread(t,d3);
        t1.start();
        t2.start();
        t3.start();
        t.interrupt();
    }
}
 

執行結果: