Java Lock 클래스는 어떤 기능을 제공합니까?

ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); Lock readLock = lock.readLock(); Lock writeLock = lock.writeLock(); private int x = 0; private void count() { writeLock.lock(); try { x++; } finally { writeLock.unlock(); } } private void print(int time) { readLock.lock(); try { for (int i = 0; i < time; i++) { System.out.print(x + " "); } System.out.println(); } finally { readLock.unlock(); } }