线程冲突案例演示

我们以银行取款经典案例来演示线程冲突现象。

银行取款的基本流程可以分为如下几个步骤。

（1）用户输入账户、密码，系统判断用户的账户、密码是否匹配。

（2）用户输入取款金额。

（3）系统判断账户余额是否大于或等于取款金额。

（4）如果余额大于或等于取款金额，则取钱成功；如果余额小于取款金额，则取钱失败。

/**
 * 账户类
 */
class Account{
    //账号
    private String accountNo;
    //账户的余额
    private double balance;

    public Account(){
    }

    public Acount(String accountNo,double balance){
        this.acountNo = acountNo;
        this.balance = balance;
    }

    public String getAccountNo(){
        return accountNo;
    }

    public void setAccountNo(String accountNo){
        this.accountNo = accountNo;
    }

    public double getBalance(){
        return balance;
    }

    public void setBalance(double balance){
        this.balance = balance;
    }
}

/**
 * 取款线程
 */
class DrawThread implements Runnable {
    //账户对象
    private Account account;
    //取款金额
    private double drawMoney;
    public DrawThread(Account account,double drawMoney){
        this.account = account;
        this.drawMoney = drawMoney;
    }

    /**
     * 取款线程
     */
    @Override
    public void run(){
        //判断当前账户余额是否大于或等于取款金额
        if(this.account.getBalance() >= this.drawMoney){
            System.out.println(Thread.currentThread().getName()+" 取款成功！吐出钞票："+this.drawMoney);
            try{
                Thread.sleep(1000);
            }catch(InterruptedException e){
                e.printStackTrace();
            }
            //更新账户金额
            this.account.setBalance(this.account.getBalance()-this.drawMoney);
            System.out.println("\t 余额为："+this.account.getBalance());
        }else{
            System.out.println(Thread.currentThread().getName+" 取款失败，余额不足");
        }
    }
}

public class TestDrawMoneyThread {
    public static void main(String[] args){
        Account account = new Account("1234",1000);
        new Thread(new DrawThread(account,800),"丈夫").start();
        new Thread(new DrawThread(account,800),"妻子").start();
    }
}