/**
* 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 ch
* @create 2021-02-15 下午 3:54
*/
package com.chh.exer; 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(); } }