并发锁除了synchronized，你还得知道Lock

package com.ams.thread.lesson5;

import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 关注微信公众号"AI码师"获取项目源码及2021面试题一套
 *
 * @author: AI码师
 * Date: 2021/12/30 5:01 上午
 * Description:
 */
@Slf4j
public class Example15 {
    private static Lock lock = new ReentrantLock();
    public static void main(String[] args) {
        lock.lock();
        try{
            
        }finally {
            lock.unlock();
        }
    }
}