threadgrouptest.java

疯狂Java讲义_源码(含Java设计模式CHM

/**
 * Description:
 * <br/>Copyright (C), 2008-2010, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */

class TestThread extends Thread
{
	//提供指定线程名的构造器
	public TestThread(String name)
	{
		super(name);
	}
	//提供指定线程名、线程组的构造器
	public TestThread(ThreadGroup group , String name)
	{
		super(group, name);
	}
	public void run()
	{
		for (int i = 0; i < 20 ; i++ )
		{
			System.out.println(getName() + " 线程的i变量" + i);
		}
	}
}
public class ThreadGroupTest
{
	public static void main(String[] args) 
	{
		//获取主线程所在的线程组，这是所有线程默认的线程组
		ThreadGroup mainGroup = Thread.currentThread().getThreadGroup();
		System.out.println("主线程组的名字：" 
			+ mainGroup.getName());
		System.out.println("主线程组是否是后台线程组：" 
			+ mainGroup.isDaemon());

		new TestThread("主线程组的线程").start();
		ThreadGroup tg = new ThreadGroup("新线程组");
		tg.setDaemon(true);
		System.out.println("tg线程组是否是后台线程组：" 
			+ tg.isDaemon());
		TestThread tt = new TestThread(tg , "tg组的线程甲");
		tt.start();
		new TestThread(tg , "tg组的线程乙").start();
	}
}