Run2_groupAddThreadMoreLevel.java

package com.brianway.learning.java.multithread.supplement.example2;

/**
 * Created by Brian on 2016/4/17.
 */

/**
 * P287
 * 线程对象关联线程组,多级关联
 */
public class Run2_groupAddThreadMoreLevel {
    public static void main(String[] args) {
        ThreadGroup mainGroup = Thread.currentThread().getThreadGroup();
        ThreadGroup group = new ThreadGroup(mainGroup, "A");
        Runnable runnable = new Runnable() {
            public void run() {
                try {
                    System.out.println("run!");
                    Thread.sleep(10000);//运行状态才可以受组管理
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };

        Thread newThread = new Thread(group, runnable);
        newThread.setName("z");
        newThread.start();//线程启动然后才归到组A

        ThreadGroup[] listGroup = new ThreadGroup[Thread.currentThread().getThreadGroup().activeGroupCount()];
        Thread.currentThread().getThreadGroup().enumerate(listGroup);
        System.out.println("main线程中有多少个子线程组：" + listGroup.length + " 名字为：" + listGroup[0].getName());
        Thread[] listThread = new Thread[listGroup[0].activeCount()];
        listGroup[0].enumerate(listThread);
        System.out.println(listThread[0].getName());

    }
}


/*
输出：
main线程中有多少个子线程组：1 名字为：A
run!
z
 */