ReentrantLock+Condition实现线程精准唤醒

最新推荐文章于 2025-06-20 12:34:53 发布

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最新推荐文章于 2025-06-20 12:34:53 发布

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分类专栏：多线程

本文链接：https://blog.youkuaiyun.com/yinianxx/article/details/106032617

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本文介绍了一种使用Java的ReentrantLock和Condition实现的线程同步方案，通过三个线程顺序打印A、B、C字符，展示了如何利用锁和条件变量确保线程间的正确同步和执行顺序。

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让三个线程顺序打印A,B,C

具体代码

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

public class Main{
    public static void main(String[] args)  {
        Test test = new Test();
        new Thread(()->{
           while(true){
                test.printA();
            }
        },"A").start();
        new Thread(()->{
            while(true){
                test.printB();
            }
        },"B").start();
        new Thread(()->{
            while(true){
                test.printC();
            }
        },"C").start();
    }
}
class Test {
    private int flag = 1;
    private Lock lock = new ReentrantLock();
    private Condition c1 = lock.newCondition();
    private Condition c2 = lock.newCondition();
    private Condition c3 = lock.newCondition();

    public void printA(){
        lock.lock();
        try{
            while(flag!=1){
                c1.await();
            }
            System.out.println("A");
            flag = 2;
            c2.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void printB(){
        lock.lock();
        try{
            while(flag!=2){
                c2.await();
            }
            System.out.println("B");
            flag = 3;
            c3.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void printC(){
        lock.lock();
        try{
            while(flag!=3){
                c3.await();
            }
            System.out.println("C");
            flag = 1;
            c1.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

}