场景描述：

模拟10个线程，并发执行，最后汇总结果

代码：

package com.jf.service.market.impl;import java.util.concurrent.CountDownLatch;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class CountDownLatchTest {	   public static void main(String[] args) {	    int num = 10;	    long time = System.currentTimeMillis();	    ExecutorService cachedThreadPool = Executors.newCachedThreadPool();		final CountDownLatch latch = new CountDownLatch(num);		for (int i = 0; i < 10; i++) {			cachedThreadPool.execute(new Runnable() {				public void run() {					try {						Thread.sleep(1000);					} catch (InterruptedException e) {						e.printStackTrace();					}					System.out.println(" End=== Thread："+Thread.currentThread().getId()); 					latch.countDown();				}			});		}		try {			latch.await();		} catch (InterruptedException e) {			e.printStackTrace();		}		System.out.println("总共耗时:" + (System.currentTimeMillis()-time));		cachedThreadPool.shutdown();    }}

 

结果展示：

 End=== Thread：10

 End=== Thread：15  End=== Thread：17  End=== Thread：16  End=== Thread：14  End=== Thread：13  End=== Thread：12  End=== Thread：9  End=== Thread：11  End=== Thread：18 总共耗时:1008