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。实践代码package com.GitHub
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。
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。更多详情敬请关注编程网精选频道。
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