package com.zhangxueliang.day_20191108;import java.util.concurrent.CountDownLatch;/*** 計算多線程的運行時間* @author Administrator**/ public class CountDownLatchDemo {public static void main(String[] args) {CountDownLatch countDownLatch = new CountDownLatch(5);LatchDemo latchDemo = new LatchDemo(countDownLatch);long begin = System.currentTimeMillis();for (int i = 0; i < 5; i++) {new Thread(latchDemo).start();}try {countDownLatch.await();} catch (InterruptedException e) {e.printStackTrace();}long end = System.currentTimeMillis();System.out.println("多線程運行共耗時："+(end-begin)+"毫秒");}}class LatchDemo implements Runnable{private CountDownLatch countDownLatch;public LatchDemo() {super();}public LatchDemo(CountDownLatch countDownLatch) {super();this.countDownLatch = countDownLatch;}@Overridepublic void run() {try{for (int i = 0; i < 50000; i++) {if(i%2==0){System.out.println(i);}}}finally{countDownLatch.countDown();}}}

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