线程不安全三大案例_不安全的取钱案例

package com.qiliang.demo13_线程同步安全;

// 线程同步安全问题,不安全的取钱案例
public class UnSafeBank {
    public static void main(String[] args) {
        Account account = new Account(100, "结婚基金");

        Drawing xiaoli = new Drawing("小李", account, 50);
        Drawing xiaowang = new Drawing("小王", account, 100);

        xiaoli.start();
        xiaowang.start();

    }

}

// 账户
class Account{
    int money;  // 余额
    String name; // 卡名

    public Account(int money, String name) {
        this.money = money;
        this.name = name;
    }
}

// 银行 : 模拟取款
class Drawing extends Thread{
    Account account; // 账户
    // 取了多少钱
    int drawingMoney;
    // 现在手里有多少钱
    int nowMoney;

    public Drawing(String name, Account account, int drawingMoney) {
        super(name);
        this.account = account;
        this.drawingMoney = drawingMoney;

    }

    // 取钱

    @Override
    public void run() {
        // 判断有没有钱
        if (account.money-drawingMoney<0) {
            System.out.println(Thread.currentThread().getName()
            +"钱不够,取不了!");
            return;
        }

        // 模拟延时
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        // 卡内余额 = 余额 - 你取的钱
        account.money = account.money - drawingMoney;
        // 你手里的钱
        nowMoney = nowMoney + drawingMoney;

        System.out.println(account.name+"余额为"+account.money);
        // Thread.currentThread().getName() = this.getName()
        System.out.println(this.getName()+"手里的钱:"+nowMoney);

    }
}