java - java可以只使用ReentrantLock来保证非违反变量在线程中可见吗

Question

问题是:a++操作是否对其他线程可见？

Thread thread = new Thread(new Runnable() {
        @Override
        public void run() {
            for (; ; ) {
                lock.lock();
                try {
                    //a++ operation is visible to other thread????
                    a++;
                } finally {
                    lock.unlock();
                }
            }
        }
    });

Answer 1

仅对获取相同锁的线程保证可见性。