如何在Java中同步工作

public class SynchronizedExample {
    private int count;

    public synchronized void increment() {
        count++;
    }

    public synchronized void decrement() {
        count--;
    }
}

import java.util.concurrent.locks.ReentrantLock;

public class ReentrantLockExample {
    private int count;
    private ReentrantLock lock = new ReentrantLock();

    public void increment() {
        lock.lock();
        try {
            count++;
        } finally {
            lock.unlock();
        }
    }

    public void decrement() {
        lock.lock();
        try {
            count--;
        } finally {
            lock.unlock();
        }
    }
}