两个线程不安全样例

桃扇骨 2023-10-01 21:33 15阅读 0赞

## 一、模拟买票 ##

public class UnSafeBuyTicket {
        public static void main(String[] args) {
            BuyTicket buyTicket = new BuyTicket();
            new Thread(buyTicket,"我").start();
            new Thread(buyTicket,"你们").start();
            new Thread(buyTicket,"黄牛党").start();
        }
    }
    class BuyTicket implements Runnable{
        //票
        private int ticket = 10;
        boolean flag = true;
        @SneakyThrows
        @Override
        public void run() {
            while (flag){
                buy();
            }
        }
        //买票
        private void buy() throws InterruptedException {
            if (ticket <= 0){
                flag = false;
                return;
            }
            Thread.sleep(1000);
            System.out.println(Thread.currentThread().getName()+"拿到"+ticket--);
        }
    }

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAY3JhenlLLg_size_12_color_FFFFFF_t_70_g_se_x_16][]

## 二、模拟银行取钱 ##

public class UnSafeBank {
        public static void main(String[] args) {
            Account account = new Account(100,"信用卡");
            Bank you = new Bank(account,50,"你");
            Bank me = new Bank(account,100,"我");
            you.start();
            me.start();
        }
    }
    //账户
    class Account{
        int money;
        String name;
    
        public Account(int money, String name) {
            this.money = money;
            this.name = name;
        }
    }
    //银行
    class Bank extends Thread{
        //账户
        Account account;
        //取了多少钱
        int drawMoney;
        //现在手里有多少钱
        int nowMoney;
    
        public Bank(Account account, int drawMoney, String name) {
            super(name);
            this.account = account;
            this.drawMoney = drawMoney;
        }
        //取钱
        @SneakyThrows
        public void run(){
            //判断有没有钱
            if (account.money - drawMoney < 0){
                System.out.println(Thread.currentThread().getName()+"：您的余额不足！");
                return;
            }
            Thread.sleep(1000);
            //银行卡内余额  = 余额 - 取出的钱
            account.money = account.money - drawMoney;
            //用户手里的钱
            nowMoney = nowMoney + drawMoney;
            System.out.println(account.name+"余额为："+account.money);
            System.out.println(this.getName()+"手里的钱"+nowMoney);
        }
    }

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAY3JhenlLLg_size_20_color_FFFFFF_t_70_g_se_x_16][]

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[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAY3JhenlLLg_size_20_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/5bb426a1de814023b45139e0e78e8e63.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY3JhenlLLg==,size_20,color_FFFFFF,t_70,g_se,x_16