//不安全取钱
//两个人去银行取钱，账户
//银行取钱：给账户上锁
public class UnsafeBank {
public static void main(String[] args) {
//账户
Account3 account = new Account3(1000,"生活费");
Drawing you = new Drawing(account,500,"你");
Drawing son = new Drawing(account,1000,"儿子");
you.start();
son.start();
}
}
//账户
class Account3{
int money; //余额
String name;
public Account3(int money, String name) {
this.money = money;
this.name = name;
}
}
//银行：模拟取款
class Drawing extends Thread{
Account3 account;//账户
int drawingMoney;
//现在手里还有多少钱
int nowMoney;
public Drawing(Account3 account,int drawingMoney,String name){
super(name);
this.account=account;
this.drawingMoney=drawingMoney;
}
//取钱
//synchronized默认锁this.
@Override
public void run(){
synchronized (account){
//判断有没有钱
if (account.money-drawingMoney<0){
System.out.println(Thread.currentThread().getName()+"钱不够取不了");
return;
}
try {//sleep放大问题的发生性
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
//卡里的余额=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);
}
}
}
