模拟银行取钱过程

小咪咪 2023-10-04 16:07 9阅读 0赞

### 模拟银行取钱（Java） ###

package src.syn;
    //需要两个人去银行取钱-->需要账户
    public class UnsafeBank {
        
        public static void main(String[] args) {
        
            //账户
            Account account = new Account(100, "结婚资金");
            Drawing you = new Drawing(account, 50, "你");
            Drawing yougirlfriend = new Drawing(account, 100, "yougirlfriend");
            you.start();
            yougirlfriend.start();
        }
    }
    
    
    //账户
    class Account {
        
        int money;//余额
        String name;//卡号
    
        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
        int drawingMoney; //取了多少钱
        int nowMoney;  //现手里的钱
    
        public Drawing(Account account, int drawingMoney, String name) {
        
            super(name);
            this.account = account;
            this.drawingMoney = drawingMoney;
        }
    
        @Override    //取钱
        // synchronized  默认的锁是this.
        //锁的对象就是变化的量，即需要增删改的量
        public void run() {
        
            synchronized (account) {
        
                if (account.money - drawingMoney < 0) {
        //判断账户是否有余额
                    System.out.println(Thread.currentThread().getName() + "无法取钱，余额不足！");
                    return;
                }
                try {
        
                    Thread.sleep(1000); //sleep放大问题的发生性
                } catch (InterruptedException e) {
        
                    e.printStackTrace();
                }
                account.money = account.money - drawingMoney;//卡内余额=余额-你取的钱
                nowMoney = nowMoney + drawingMoney;  //你手里的钱
                System.out.println(Thread.currentThread().getName() + "手里的钱：" + nowMoney);
                System.out.println(account.name + "余额为：" + account.money);
                //这里this.getName()等价于Thread.currentThread().getName()
    
            }
    
        }
    
    
    }