旧版本的ATM

package com.lovo;import java.io.FileReader;import java.io.FileWriter;import java.util.Properties;import javax.swing.JOptionPane;public class ATM {public static void main(String[] args) {login();}/* * 登陆 */public static void login() {JOptionPane.showMessageDialog(null, "欢迎光临");String s= getdata("userName.txt","用户名");String sp= getdata("psw.txt","密码");int i = 0;for (i = 0; i < 3; i++) {String str1 = JOptionPane.showInputDialog(null, "请输入用户名");String str2 = JOptionPane.showInputDialog(null, "请输入密码");if (str1.equals(s) && str2.equals(sp)) {JOptionPane.showMessageDialog(null, "登陆成功");break;} else {JOptionPane.showMessageDialog(null, "用户名或密码错误");}}if (i == 3) {JOptionPane.showMessageDialog(null, "非法用户");} else {while (true) {String str = JOptionPane.showInputDialog(null, "1、存款" + "\n"+ "2、取款" + "\n" + "3、查询" + "\n" + "4、改密" + "\n"+ "5、退出");int type = Integer.parseInt(str);if (type == 1) {saveMoney();}if (type == 2) {getMoney();}if (type == 3) {getInfo();}if (type == 4) {changPassWord();}if (type == 5) {break;}}}}/* * 存钱 */public static void saveMoney() {String str = JOptionPane.showInputDialog(null, "请输入存款金额");int money = Integer.parseInt(str);String sp= getdata("money.txt","money");int a = Integer.parseInt(sp);a = a + money;setdata("money",a+"","money.txt");}/* * 取钱 */public static void getMoney() {String str = JOptionPane.showInputDialog(null, "请输入取款金额");int money = Integer.parseInt(str);String s=getdata("money.txt","money");int a = Integer.parseInt(s);if (a < money) {JOptionPane.showMessageDialog(null, "账号已超支");} else {int b = a - money;setdata("money",b+"","money.txt");}}/* * 查询余额 */public static void getInfo() {String s =getdata("money.txt","money");JOptionPane.showMessageDialog(null, "账号余额为" + s);}/* * 修改密码 */public static void changPassWord() {String str1 = JOptionPane.showInputDialog(null, "请输入新密码");String str2 = JOptionPane.showInputDialog(null, "请确认新密码");if (str1.equals(str2)) {setdata("密码",str1,"psw.txt");}else{JOptionPane.showMessageDialog(null, "两次输入密码不一致");}} /* * 获取数据 */ public static String getdata(String s,String p){ Properties pro = new Properties();try {pro.load(new FileReader(s));} catch (Exception e) {System.out.println("文件不存在");}String st = pro.getProperty(p); return st; } /*  * 保存数据  */ public static void setdata(String s,String p,String q){ Properties pro = new Properties(); pro.setProperty(s, p);try {pro.store(new FileWriter(q), null);} catch (Exception e) {System.out.println("文件不存在");} }}