What functionality does the Java Lock class provide?

Explanation

1. Lock is an interface under the java.util.concurent package, which defines a series of locking operation methods.

2. The Lock interface mainly includes ReentrantLock, ReentrantReadWriteLock, ReentrantReadWriteLock, and WriteLock implementation classes.

Different from Synchronized, Lock provides related interfaces such as acquiring locks and releasing locks, making it more flexible to use and more complex to operate.

Example

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();
    }
}

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