多线程 线程组 ThreadGroup

package org.zln.thread;

import java.util.Date;

/**
 * Created by sherry on 000024/6/24 22:30.
 */
public class TestThreadGroup {
    public static void main(String[] args) throws InterruptedException {
        ThreadGroup group1 = new ThreadGroup("group1");
        /*group2从属于group1  group1是父 group2是子*/
        ThreadGroup group2 = new ThreadGroup(group1,"group2");
        /*关联线程与线程组*/
        Thread t1 = new Thread(group1,new TestThread(1000,"AAA"));
        Thread t2 = new Thread(group2,new TestThread(1000,"BBB"));
        Thread t3 = new Thread(group2,new TestThread(1000,"CCC"));
        t1.start();
        t2.start();
        t3.start();
        System.out.println("线程组1线程数量："+group1.activeCount());
        System.out.println("线程组2线程数量："+group2.activeCount());
        System.out.println("线程组1线程组数量："+group1.activeGroupCount());

        /*10秒后停止所有任务*/
        for (int i = 0; i < 10; i++) {
            Thread.sleep(1000);
            System.out.println(new Date());
        }
        group1.stop();//这里只是为了演示 stop是不安全的。实际开发中不要用
    }
}

---

package org.zln.thread;

import java.util.Date;

/**
 * Created by coolkid on 2015/6/21 0021.
 */
public class TestThread extends Thread{
    private int time;//休眠时间
    private String user;//调用用户

    public TestThread(int time, String user) {
        this.time = time;
        this.user = user;
    }

    @Override
    public void run() {
        while (true){
            try {
                System.out.println(Thread.currentThread().getName()+"	"+user+" 休息 "+time+"ms-"+new Date());
                Thread.sleep(time);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        Thread thread1 = new TestThread(1000,"Jack");
        Thread thread2 = new TestThread(3000,"Mike");
        thread2.setPriority(Thread.MAX_PRIORITY);
        thread1.start();
        thread2.start();
    }
}

使用线程组的好处在于能够对线程组内的线程进行批量操作，同时线程组之间也可以拥有包含关系，或者叫父子关系