thread2.java

Java Classic Examples是我买的两本书：《JAVA经典实例》和《java入门经典源代码》里边附送光盘里带的源码

public class Thread2 extends Thread
{
    public Thread2(ThreadGroup tg, String name)
    {
        super(tg,name);
    }
    public void run()
    {
        try
        {
            System.out.print(getName()+" sleep  ");
            this.sleep(1000);                      //睡眠一秒钟
        }
        catch(InterruptedException e)
        {
            System.out.println(e.getMessage());
        }
        System.out.print(getName() +" end!  ");
    }
    public static void main (String args[])
    {
        ThreadGroup  tg1 = new ThreadGroup("tg1"); //创建一个线程组
        new Thread2(tg1,"A").start();
        new Thread2(tg1,"B").start();
        
        ThreadGroup  tg2 = new ThreadGroup("tg2");
        new Thread2(tg2,"C").start();
        new Thread2(tg2,"D").start();
        
        Thread curt = Thread.currentThread();      //返回当前活动线程
        System.out.println("currentThread="+curt.getName());
        System.out.println("getPriority = "+curt.getPriority());//优先级
        System.out.println("activeCount="+Thread.activeCount());
        Thread ta[]=new Thread[10];
        Thread.enumerate(ta);            //将当前活动线程复制到ta数组中
        System.out.println("Group_Name   isAlive()");
        for (int i=0;i<Thread.activeCount();i++)
            System.out.println(ta[i].getThreadGroup().getName()
                            +"_"+ta[i].getName()+"  "+ta[i].isAlive());
    }
}