不安全线程取钱

package 多线程练习;

import com.sun.javafx.sg.prism.web.NGWebView;

import java.math.BigDecimal;

/*
   模拟两个人同时取钱的情况
 */
public class UnSafeAccount {
    public static void main(String[] args) {
        Bank bank = new Bank("12345", new BigDecimal("100"));
        WithDrawMoney xiaoming = new WithDrawMoney(bank, new BigDecimal("50"), "小明");
        WithDrawMoney xiaomingxf = new WithDrawMoney(bank, new BigDecimal("100"), "小明媳妇");
        xiaoming.start();
        xiaomingxf.start();

    }
}


/*
   银行类
 */
class Bank {
    String cardNumer;    // 卡号
    BigDecimal balance;  // 余额  小tip:Java中用BigDecimal 来表示金钱类型

    public Bank(String cardNumer, BigDecimal balance) {
        this.cardNumer = cardNumer;
        this.balance = balance;
    }

}

class WithDrawMoney extends Thread {
    //  模拟正式环境全部私有
    Bank bank;
    BigDecimal nowMoney = new BigDecimal("0");   // 手里的钱
    BigDecimal drawMoney;  // 取走的钱

    // 构造方法
    public WithDrawMoney(Bank bank, BigDecimal drawMoney, String name) {
        super(name);  // 调用父类的只能用在第一行
        this.bank = bank;
        this.drawMoney = drawMoney;
    }

    @Override
    public void run() {
        if (bank.balance.subtract(drawMoney).compareTo(BigDecimal.ZERO) == -1) {
            System.out.println(this.getName() + " 钱不够了，取钱失败");  // 线程类中this.getName() ==  Thread.currentThread.getName()
            return;
        }

        try {
            Thread.sleep(500);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        nowMoney = nowMoney.add(drawMoney);                       // 手里的钱
        bank.balance = (bank.balance.subtract(drawMoney));        // 卡上余额 subtract 减法  add 加法
        System.out.println(this.getName() + " 手里有 " + nowMoney + "钱");
        System.out.println("卡上余额：" + bank.balance);
    }


}

输出结果