如何检查哪个线程持有监视器？

Object lock = new Object();

// 线程1
Thread thread1 = new Thread(() -> {
    synchronized (lock) {
        System.out.println("线程1获取了锁");
        System.out.println("线程1是否持有锁：" + Thread.holdsLock(lock));
    }
});

// 线程2
Thread thread2 = new Thread(() -> {
    System.out.println("线程2是否持有锁：" + Thread.holdsLock(lock));
});

thread1.start();
thread2.start();

线程1获取了锁
线程1是否持有锁：true
线程2是否持有锁：false