自制悲观锁_a. 假设当当网上用户下单买了本书,这时数据库中有条订单号为 101的订单,其中有个s-优快云博客

本文链接：https://blog.youkuaiyun.com/mark_to_win/article/details/85015229

本文介绍了一种自制的悲观锁实现方式，通过一个具体的Java代码示例，展示了如何使用标记来实现线程间的同步，防止资源竞争。文章通过创建Ticket_Pess_MarkToWin类，演示了悲观锁的基本原理及其在多线程环境下的应用。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

i）自制悲观锁：

例 2.2.1.1

package com;
public class Ticket_Pess_MarkToWin {
    private int number=4;
    private int lock=0;
    public synchronized int getLock()
    {

            System.out.println("最后还剩"+number);
        }else{
            System.out.println("不够了，买几张失败");
        }
    }

}

package com;
class MulThreMarkToWin extends Thread {
    Ticket_Pess_MarkToWin ticPes_MarkToWin;
    public MulThreMarkToWin(Ticket_Pess_MarkToWin ticPes_MarkToWin) {

            System.out.println("没拿到锁，没干成");
        }
    }
}
class MulThreMarkToWinBatch extends Thread {
    Ticket_Pess_MarkToWin ticPes_MarkToWin;
    public MulThreMarkToWinBatch(Ticket_Pess_MarkToWin ticPes_MarkToWin) {
        this.ticPes_MarkToWin=ticPes_MarkToWin;
    }
    public void run() {

    }
}
public class TestConcurBuy_MarkToWin {
    public static void main(String[] args) {
        Ticket_Pess_MarkToWin ticPes_MarkToWin=new Ticket_Pess_MarkToWin();
        Thread t1 = new MulThreMarkToWin(ticPes_MarkToWin);
        Thread t2 = new MulThreMarkToWinBatch(ticPes_MarkToWin);
        Thread t3 = new MulThreMarkToWin(ticPes_MarkToWin);
        t1.start();
        t2.start();
        t3.start();
    }
}