重新修改程序，每次線程執行減少1

package com.gwolf;

import java.util.concurrent.CountDownLatch;

public class TestCountDownLatch {

public static void? main(String[] args) throws InterruptedException {

CountDownLatch countDownLatch = new CountDownLatch(5);

LatchDemo latchDemo = new LatchDemo(countDownLatch);

long start = System.currentTimeMillis();

for(int i = 0;i< 10;i++) {

new Thread(latchDemo).start();

}

countDownLatch.await();

long end = System.currentTimeMillis();

System.out.println("耗費時間：" + (end -start));

}

}

class LatchDemo implements Runnable {

//閉鎖

private CountDownLatch countDownLatch;

public LatchDemo(CountDownLatch countDownLatch) {

this.countDownLatch = countDownLatch;

}

@Override

public void run() {

synchronized (this) {

try {

for (int i = 0; i < 500000; i++) {

if (i % 2 == 0) {

System.out.println(i);

}

}

} finally {

countDownLatch.countDown();

}

}

}

}

總結

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