package com.atguigu.exer;
/**
* 银行有一个账户。
有两个储户分别向同一个账户存3000元,每次存1000,存3次。每次存完打印账户余额。
分析:
1.是否是多线程问题? 是,两个储户线程
2.是否有共享数据? 有,账户(或账户余额)
3.是否有线程安全问题?有
4.需要考虑如何解决线程安全问题?同步机制:有三种方式。
* @author shkstart
* @create 2019-02-15 下午 3:54
*/
class Account{
private double balance;
public Account(double balance) {
this.balance = balance;
}
//存钱
public synchronized void deposit(double amt){
if(amt > 0){
balance += amt;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName() + ":存钱成功。余额为:" + balance);
}
}
}
class Customer extends Thread{
private Account acct;
public Customer(Account acct) {
this.acct = acct;
}
@Override
public void run() {
for (int i = 0; i < 3; i++) {
acct.deposit(1000);
}
}
}
public class AccountTest {
public static void main(String[] args) {
Account acct = new Account(0);
Customer c1 = new Customer(acct);
Customer c2 = new Customer(acct);
c1.setName("甲");
c2.setName("乙");
c1.start();
c2.start();
}
}