java - 如何在调用解锁之前发生异常时解锁 ReentrantLock 对象

Question

在下面如果 syncMethod2() 发生异常，那么我该如何解锁锁定对象？

public class ReEntrantLock {
ReentrantLock lock = new ReentrantLock();

void syncMethod1() {
  lock.lock();
  syncMethod2(); // throw new NullPointerException();
  lock.unlock();
}

}

Answer 1

public class ReEntrantLock {
    ReentrantLock lock = new ReentrantLock();

    void syncMethod1() {
        lock.lock();
        try {
            syncMethod2();
        } finally {
            lock.unlock();
        }
    }

}

它就在 documentation 中...