threadgroupdemo.java

JAVA的一些基础教程

public class ThreadGroupDemo extends Thread{
	public static void 创建线程组(){
		ThreadGroup group = new ThreadGroup("函数创建的线程组");
		System.out.println("函数中创建的线程组的父线程组:"+ 
			group.getParent().getName());
	}

	public static void 创建线程(){
		Runnable r = new Runnable(){
			public void run(){
				try{
				创建线程组();
				Thread.sleep(1000*10);
				}catch(Exception e){}
				System.out.println("线程"+ Thread.currentThread().getName() + "属于 " +
				Thread.currentThread().getThreadGroup().getName() + " 执行完毕");
			}
		};
		Thread t = new Thread(r);
		t.start();
	}

	public static void main(String arg[]) throws Exception{
		ThreadGroup group = Thread.currentThread().getThreadGroup();
		System.out.println("当前线程组:"+ group.getName());
		ThreadGroup group1 = new ThreadGroup("我的线程组");
		Runnable r = new Runnable(){
			public void run(){
				try{
				创建线程();
				Thread.sleep(1000*10);
				}catch(Exception e){}
				System.out.println("线程"+ Thread.currentThread().getName() + "属于 " +
				Thread.currentThread().getThreadGroup().getName() + " 执行完毕");
			}
		};

		Thread 线程1 = new Thread(r,"线程1");
		Thread 线程2 = new Thread(group1,r,"线程2");
		线程1.start();
		线程2.start();
		Thread.sleep(1000*1);
		System.out.println("num:"+group.activeCount());
		Thread 线程组[] = new Thread[group.activeCount()];
		int threadNum = group.enumerate(线程组);
		System.out.println("\n当前线程组:"+ group.getName() + "下有以下线程\n");
		for(int i=0; i< threadNum; i++)
			System.out.println(线程组[i].getName());
	}
}