高并发--并发编程的三大辅助类

2023-03-14 15:32:51

Countdownlatch：减一操作，直到为0再继续向下执行

复制
package Kuangshen.JUC.Thread;

import java.util.concurrent.CountDownLatch;

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

    final CountDownLatch countDownLatch = new CountDownLatch(5);

    for (int i = 0; i < 5; i++) {
        new Thread(() -> {
            System.out.println(Thread.currentThread().getName() + "get out");
            countDownLatch.countDown();
            }, String.valueOf(i)).start();
    }
    countDownLatch.await(); //等待上述执行完毕再向下执行
    System.out.println("close door");
}

}

Cyclicbarrier：+1操作，对于每个线程都自动+1并等待，累计到规定值再向下执行，

复制
package Kuangshen.JUC.Thread;

import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;

/**

  • @author ：Empirefree

  • @description：TODO

  • @date ：2021/2/10 10:56
    */
    public class cyclicbarrier {
    public static void main(String[] args) throws BrokenBarrierException, InterruptedException {
    //CyclicBarrier里面是容量 + runnable
    final CyclicBarrier cyclicBarrier = new CyclicBarrier(7, () ->{
    System.out.println(“不断增加到7即向后执行，与countdownlatch相反”);
    }
    );

     /*对于指派的局部变量,lambda只能捕获一次 ，故而需定义成final(int内部定义就是final),而且线程中，
 不能对局部变量进行修改，如需要修改，需定义成原子类atomic
 */
 for (int i = 0; i < 7; i++) {
     int finalI = i;
     new Thread(() ->{
         System.out.println(finalI);
         try {
             cyclicBarrier.await();
         } catch (InterruptedException e) {
             e.printStackTrace();
         } catch (BrokenBarrierException e) {
             e.printStackTrace();
         }

     }).start();
 }

    }

}

semaphore：对于规定的值，多个线程只规定有指定的值能获取，每次获取都需要最终释放，保证一定能互斥执行

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package Kuangshen.JUC.Thread;
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