多线程Demo-CountDownLatch减数器

最新推荐文章于 2022-07-21 15:00:48 发布

酷鱼影子

最新推荐文章于 2022-07-21 15:00:48 发布

阅读量708

点赞数

分类专栏：多线程文章标签： CountDownLatch

本文链接：https://blog.youkuaiyun.com/kuyuyingzi/article/details/43562199

版权

多线程专栏收录该内容

29 篇文章

订阅专栏

本文详细介绍了使用Java中的CountDownLatch来管理多线程同步的问题，通过实例展示了如何在并发环境中实现线程间的等待和通知机制。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

package Thread;

import java.util.Random;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

//CountDownLatch多线程，当一个线程到达指定位置执行countDown，计数器会减1，当计数器减到0时await就是释放线程
public class CountDownLatchTest {
public static void main(String[] args) {
CountDownLatchTest.Business countTest = new CountDownLatchTest.Business();
countTest.start();
}
static class Business{
CountDownLatch refereeCount = new CountDownLatch(1);
CountDownLatch athleteCount = new CountDownLatch(3);//初始化计数器大小
public void start(){
ExecutorService pool = Executors.newCachedThreadPool();
for(int i=0; i<3; i++){
Runnable runable = new Runnable() {
@Override
public void run() {
athlete();
}
};
pool.execute(runable);
}
try {
TimeUnit.SECONDS.sleep(2);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
referee();
pool.shutdown();
}
public void referee(){
refereeCount.countDown();
System.out.println(Thread.currentThread().getName()+" 裁判发令");
try {
athleteCount.await();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+" 运动员跑完裁判统计时间");
}
public void athlete(){
System.out.println(Thread.currentThread().getName()+" 运动等待发令");
try {
refereeCount.await();
System.out.println(Thread.currentThread().getName()+" 运动收到发令");
try {
System.out.println(Thread.currentThread().getName()+" 运动开始跑");
TimeUnit.SECONDS.sleep(new Random().nextInt(10));
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
athleteCount.countDown();
}
}
}