公平锁和非公平锁（demo）

最新推荐文章于 2025-06-16 14:00:24 发布

ArcProDreLHh

最新推荐文章于 2025-06-16 14:00:24 发布

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分类专栏： java并发

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本文通过创建公平锁和非公平锁的实例，演示了在Java中使用ReentrantLock实现这两种锁的区别。通过多个线程尝试获取锁的过程，观察到公平锁能够确保线程按请求顺序获取锁，而非公平锁则不能保证这一顺序。

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package cn.limbo.thread.Fair_noFair_test;

import java.util.concurrent.locks.ReentrantLock;

public class Service {
    private ReentrantLock lock;

    public Service(boolean isFair) {
        super();
        lock = new ReentrantLock(isFair);
    }

    public void serviceMethod() {
        try {
            lock.lock();
            System.out.println(" ThreadName= " + Thread.currentThread().getName() + " 获得锁定");
        } finally {
            lock.unlock();
        }
    }
}

class RunFair {
    public static void main(String[] args) {
        Service service = new Service(true);
        Runnable runable = new Runnable() {
            public void run() {
                System.out.println(" *+*线程 " + Thread.currentThread().getName() + " 运行了");
                service.serviceMethod();
            }
        };
        Thread[] threads = new Thread[10];
        for (int i = 0; i < 10; i++) {
            threads[i] = new Thread(runable);
        }
        for (int i = 0; i < 10; i++) {
            threads[i].start();
        }
        //先启动的线程首先获取到锁 (基本都是一致的)
    }
}

class RunNotFair {
    public static void main(String[] args) {
        Service service = new Service(false);
        Runnable runable = new Runnable() {
            public void run() {
                System.out.println(" *_*线程 " + Thread.currentThread().getName() + " 运行了");
                service.serviceMethod();
            }
        };
        Thread[] threads = new Thread[10];
        for (int i = 0; i < 10; i++) {
            threads[i] = new Thread(runable);
        }
        for (int i = 0; i < 10; i++) {
            threads[i].start();
        }
        //基本都不是一致的
    }
}