CountDownLatch 线程工具的使用

来源：互联网发布：赢顺交易软件编辑：程序博客网时间：2024/05/16 10:53

package test;import java.util.concurrent.CountDownLatch;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class Test2 {public static void main(String[] args) {          ExecutorService service=Executors.newCachedThreadPool();          final CountDownLatch cdOrder = new CountDownLatch(1);          final CountDownLatch cdAnswer = new CountDownLatch(3);          for(int i=0;i<3;i++){          Runnable runnable=new Runnable(){          @Override        public void run() {                                    try {                   System.out.println("线程:"+Thread.currentThread().getName()+"正在准备接受命令");  cdOrder.await();  System.out.println("线程"+Thread.currentThread().getName()+"已经接受命令");  Thread.sleep((long) (Math.random()*10000));  System.out.println("线程"+Thread.currentThread().getName()+"回应命令处理结果");} catch (InterruptedException e) {}                         }            };          service.execute(runnable);          }          try {Thread.sleep((long)(Math.random()*10000));System.out.println("线程"+Thread.currentThread().getName()+"即将发布命令");cdOrder.countDown();System.out.println("线程" + Thread.currentThread().getName() + "已发送命令，正在等待结果");cdAnswer.await();System.out.println("线程" + Thread.currentThread().getName() + "已收到所有响应结果");} catch (InterruptedException e) {e.printStackTrace();}         service.shutdown();}//运动员 百米赛跑 ，首先大家都在等待 中(三个线程在等待接受命令)，当吹口号 的人，吹起号声（已发送命令）， 完成各自的工作。}

打印结果

线程:pool-1-thread-1正在准备接受命令
线程:pool-1-thread-3正在准备接受命令
线程:pool-1-thread-2正在准备接受命令
线程main即将发布命令
线程main已发送命令，正在等待结果
线程pool-1-thread-3已经接受命令
线程pool-1-thread-1已经接受命令
线程pool-1-thread-2已经接受命令
线程pool-1-thread-1回应命令处理结果
线程pool-1-thread-2回应命令处理结果
线程pool-1-thread-3回应命令处理结果

package test;import java.text.SimpleDateFormat;import java.util.Date;import java.util.concurrent.CountDownLatch;public class Test3 {final static SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    public static void main(String[] args) throws InterruptedException {    CountDownLatch latch=new CountDownLatch(2);//两个工人的协作    Worker worker1=new Worker("zhang san", 5000, latch);    Worker worker2=new Worker("li si", 8000, latch);    worker1.start();//    worker2.start();//    latch.await();//等待所有工人完成工作        System.out.println("all work done at "+sdf.format(new Date()));}            static class Worker extends Thread{    String workerName;     int workTime;    CountDownLatch latch;    public Worker(String workerName ,int workTime ,CountDownLatch latch){     this.workerName=workerName;     this.workTime=workTime;     this.latch=latch;    }    public void run(){    System.out.println("Worker "+workerName+" do work begin at "+sdf.format(new Date()));    doWork();//工作了    System.out.println("Worker "+workerName+" do work complete at "+sdf.format(new Date()));    latch.countDown();//工人完成工作，计数器减一    }        private void doWork(){    try {Thread.sleep(workTime);} catch (InterruptedException e) {e.printStackTrace();}    }    }         }

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