本篇文章给大家分享的是有关Java中CountDownLatch的作用有哪些，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
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package com.github.gleans;
import java.util.concurrent.CountDownLatch;
public class TestCountDownLatch {
public static void main(String[] args) throws InterruptedException {
CountDownLatch latch = new CountDownLatch(3);
new KeyPass(1000L, "thin jack", latch).start();
new KeyPass(2000L, "noral jack", latch).start();
new KeyPass(3000L, "fat jack", latch).start();
latch.await();
System.out.println("此处对数据库进行最后的插入操作~");
}
static class KeyPass extends Thread {
private long times;
private CountDownLatch countDownLatch;
public KeyPass(long times, String name, CountDownLatch countDownLatch) {
super(name);
this.times = times;
this.countDownLatch = countDownLatch;
}
@Override
public void run() {
try {
System.out.println("操作人：" + Thread.currentThread().getName()
+ "对数据库进行插入，持续时间：" + this.times / 1000 + "秒");
Thread.sleep(times);
countDownLatch.countDown();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
使用await()提前结束操作
package com.github.gleans;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
public class TestCountDownLatch {
public static void main(String[] args) throws InterruptedException {
CountDownLatch latch = new CountDownLatch(3);
new KeyPass(2000L, "公司一", latch).start();
new KeyPass(3000L, "公司二", latch).start();
new KeyPass(5000L, "公司三", latch).start();
latch.await(2, TimeUnit.SECONDS);
System.out.println("~~~贾总PPT巡演~~~~");
System.out.println("~~~~融资完成，撒花~~~~");
}
static class KeyPass extends Thread {
private long times;
private CountDownLatch countDownLatch;
public KeyPass(long times, String name, CountDownLatch countDownLatch) {
super(name);
this.times = times;
this.countDownLatch = countDownLatch;
}
@Override
public void run() {
try {
Thread.sleep(times);
System.out.println("负责人：" + Thread.currentThread().getName()
+ "开始工作，持续时间：" + this.times / 1000 + "秒");
countDownLatch.countDown();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}假设公司一、公司二、公司三各需要2s、3s、5s来完成工作，贾总等不了，只能等2s，那么就设置await的超时时间
latch.await(2, TimeUnit.SECONDS);以上就是Java中CountDownLatch的作用有哪些，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注亿速云行业资讯频道。
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