使用ReentrantLock和Condition 实现线程的挂起和运行

最新推荐文章于 2024-07-17 23:39:50 发布

原创最新推荐文章于 2024-07-17 23:39:50 发布 · 492 阅读

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本文介绍了一个使用Java实现的线程同步案例，通过两个线程分别对共享变量进行加一和减一的操作，演示了如何利用ReentrantLock和Condition确保线程间的正确同步，避免竞态条件。

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package com.jack.test;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class ShareData05 {
   public int number = 0;
   public int countA = 0;
   public int countB = 0;
   public Lock lock = new ReentrantLock();
   private Condition cod = lock.newCondition();

   public void increment() throws InterruptedException {
       lock.lock();
       while (number != 0) {
           cod.await();
       }
       ++number;
       System.out.println(Thread.currentThread().getName() + number);
       cod.signalAll();
       System.out.println(Thread.currentThread().getName() + "执行了" + (++countA) + "次");
       lock.unlock();
   }

   public void decrement() throws InterruptedException {
       lock.lock();
       while (number == 0) {
           cod.await();
       }
       number--;
       System.out.println(Thread.currentThread().getName() + number);
       cod.signalAll();
       System.out.println(Thread.currentThread().getName() + "执行了" + (++countB) + "次");
       lock.unlock();
   }
}

/**
*
* @author jack 题目：两个线程，轮替操作，实现一个线程对初始值为零的一个变量，实现一个线程加一，另外一个线程减一，来10轮
*/
public class ThreadDemo05 {
   public static void main(String[] args) {
       ShareData05 sd = new ShareData05();
       new Thread(() -> {
           for (int i = 0; i < 10; i++) {
               try {
                   sd.decrement();
               } catch (Exception e) {
                   e.printStackTrace();
               }
           }
       }, "AA").start();

       new Thread(() -> {
           for (int i = 0; i < 10; i++) {
               try {
                   sd.increment();
               } catch (Exception e) {
                   e.printStackTrace();
               }
           }
       }, "BB").start();
   }

}