ReentrantLock同步getter和setter

Question

假设您有以下代码:

public int getSpeedX() {
    speedLock.lock();
    try {
        return speedX;
    } finally {
        speedLock.unlock();
    }
}

public void setSpeedX(int x) {
    speedLock.lock();
    try {
        speedX = x;
    } finally {
        speedLock.unlock();
    }
}

返回速度X好吗？或应该是:

public int getSpeedX() {
    int temp;
    speedLock.lock();
    try {
        temp = speedX;
    } finally {
        speedLock.unlock();
    }
    return temp;
}

哪个是对的？或者他们是等同的？

Answer 1

它们是等价的.finally无论块如何退出(例如,流控制输出底部,返回语句或异常),块中的任何内容都会被执行.