java乐观锁悲观锁demo

以下是Java中乐观锁和悲观锁的示例代码：

乐观锁示例代码：

public class OptimisticLock {
    private int count = 0;

    public void increment() {
        int oldValue = count;
        while (!compareAndSet(oldValue, oldValue + 1)) {
            oldValue = count;
        }
    }

    public synchronized boolean compareAndSet(int oldValue, int newValue) {
        if (count == oldValue) {
            count = newValue;
            return true;
        }
        return false;
    }
}

悲锁示例代码：

public class PessimisticLock {
    //调用1
    public synchronized void m1() {
        //加锁后的业务逻辑...
    }

    //调用2
    //保证多个线程使用的是同一个lock对象的前提下
    ReentrantLock lock = new ReentrantLock();

    public void m2() {
        lock.lock();
        try {
            //操作同步资源
        } finally {
            lock.unlock();
        }
    }
}