Java实现主线程等待子线程-电脑资料.

1、Java实现主线程等待子线程-电脑资 料 2019-01-01本文介绍两种主线程等待子线程的实现方式，以5个子线程来说明：1、使用Thread的join ()方法，join ()方法会阻塞主线程继续向下 执行， O2、使用 java. util, concurrent 中的 CountDownLatch,是一个倒数计数 器。初始化时先设置一个倒数计数初始值，每调用一次countDown ()方法， 倒数值减一，他的await ()方法会阻塞当前进程，直到倒数至0.join方式代码如下:package com. test, thread;import java. util. ArrayList;

2、import java. util. List;public class MyThread extends Thread(public MyThread (String name)(this. setName (name)；)©Overridepublic void run ()System. out. printin (this. getName ( ) + staring)；System. out. printin (this. getName ( ) + end")； ) /* ©param args*/public static void main (St

3、ring1 args) (System, out. printin ("main thread starting-'")；List list = new ArrayList ()； for (int i = 1; i <= 5; i+) (MyThread my = new MyThread ("Thrad + i)；my.start ()； list, add (my)； )try ( for (MyThread my : list) (my. join ()； ) ) catch (InterruptedException e)e.printSt

4、ackTrace ()；)System, out. printin ("main thread end)；)运行结果如下：main thread starting*Thrad 2 staring*Thrad 2 endThrad 4 staring*Thrad 4 end*Thrad 1 staring*Thrad 1 end*Thrad 3 staring*Thrad 3 endThrad 5 staring*Thrad 5 end*main thread end*CountDownLatch方式代码如下：package com. test, thread;import java.

5、 util, concurrent. CountDownLatch;public class MyThread2 extends Threadprivate CountDownLatch count;public MyThread2 (CountDownLatch count, String name)(this, count = count;this. setName (name)；)©Overridepublic void run ()(System. out. printin (this. getName ( ) + staring*)；System. out. printin

6、 (this. getName ( ) + end")；this, count. countDown ()；)/* ©param args*/public static void main (String1 args)(System, out. printin ("main thread starting-.")；CountDownLatch count = new CountDownLatch (5)；for (int i = 1; i <= 5; i+)(MyThread2 my = new MyThread2 (count, “Thread + i)；my.start ()；try(count, await ()；)catch (InterruptedException e)(e.printStackTrace ()；)System, out. printin ("main thread end)；)运行结果如下：main thread starting*Thread 2 staringThread 2 end*Thread 4 staringThread 4