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()+"\t"+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