公平锁

公平锁：

import java.util.concurrent.locks.ReentrantLock;

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

    public void serviceMethod() {
        try {
            lock.lock();
            System.out.println(Thread.currentThread().getName() + "获取的锁");
        } finally {
            lock.unlock();
        }
    }
}

public class Run {

    /**
     *    公平锁
     */
    public static void main(String[] args) {
        final Service service = new Service(true);
        
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                System.out.println("线程：" + Thread.currentThread().getName());
                service.serviceMethod();
            }
        };
        
        Thread[] threads = new Thread[10];
        for (int i = 0; i < 10; i++) {
            threads[i] = new Thread(runnable);
        }
        for (int i = 0; i < 10; i++) {
            threads[i].start();
        }
    }
}

运行结果如下：