java中ReentrantLock实现公平锁和非公平锁

// 创建公平锁
Lock fairLock = new ReentrantLock(true);
// 创建非公平锁
Lock unfairLock = new ReentrantLock(false);

class Worker implements Runnable {
    private final Lock lock;
    private final String name;

    public Worker(Lock lock, String name) {
        this.lock = lock;
        this.name = name;
    }

    @Override
    public void run() {
        for (int i = 0; i < 3; i++) {
            lock.lock();
            try {
                System.out.println(name + " 获得锁，正在执行任务 " + i);
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                lock.unlock();
                System.out.println(name + " 释放锁");
            }
        }
    }
}

public class FairAndUnFair {
    public static void main(String[] args) {
        // 创建公平锁
        Lock fairLock = new ReentrantLock(true);
        // 创建非公平锁
        Lock unfairLock = new ReentrantLock(false);

        // 使用公平锁
        System.out.println("使用公平锁：");
        Thread t1 = new Thread(new Worker(fairLock, "线程1"));
        Thread t2 = new Thread(new Worker(fairLock, "线程2"));
        t1.start();
        t2.start();
        try {
            t1.join();
            t2.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        // 使用非公平锁
        System.out.println("\n使用非公平锁：");
        t1 = new Thread(new Worker(unfairLock, "线程1"));
        t2 = new Thread(new Worker(unfairLock, "线程2"));
        t1.start();
        t2.start();
    }
}