微信零钱通

import java.util.Date;
import java.util.Scanner;

public class SmallChanageSys {
    //创建相关对象
    Scanner scanner = new Scanner(System.in);
    Date date = new Date();

    //接收零钱通明细的结果
    String result = "";

    //接收输入的金额
    double money = 0;

    //接收余额
    double balance = 0;

    //定义datestr接收当前日期时间，格式为年-月-日 时：分：秒
    String str1 = String.format("%tF", date);
    String str2 = String.format("%tT", date);
    String datestr = str1 + "t" + str2;

    //显示菜单
    public void mainMenu() {
        System.out.println("==========零钱通菜单==========");
        System.out.println("1 零钱通明细");
        System.out.println("2 收益入账");
        System.out.println("3 消   费");
        System.out.println("4 退出系统");
    }

    //零钱通的明细
    public void detail() {
        if (result.equals("")) {
            System.out.println("无记录可查，请先添加记录后再查询!");
        } else {
            System.out.println("------------------零钱通明细------------------" + result + "n");
        }
    }

    //收益入账
    public void income() {
        System.out.println("请输入收益入账金额:");
        money = scanner.nextDouble();
        balance += money;
        //date = new Date();
        //result += "n收益入账t+"+money+"t"+sdf.format(date)+"t余额t"+balance;
        result += "n收益入账t+" + money + "t" + datestr + "t余额t" + balance;
    }

    //消   费
    public void pay() {
        System.out.println("该账户余额为:" + balance);
        System.out.println("请输入消费出账金额:");
        money = scanner.nextInt();//expend支出
        if (money > balance) {
            System.out.println("对不起，余额已不足无法支出!");
            return;
        }
        balance -= money;
        result += "n消费出账t-" + money + "t" + datestr + "t余额t" + balance;
    }

    public void exit() {
        System.out.println("正在进行微信零钱通系统退出->->->n");
        //给此系统评分
        System.out.println("感谢对此系统的使用，请给出您宝贵的评价(按enter键确认):");
        int score = scanner.nextInt();
        System.out.println("已经收到您给出宝贵的" + score + "分啦!!!n");
        System.out.println("微信零钱通系统正在退出中......nn感谢对此系统的使用，欢迎下次光临!");
        return; //输入1退出系统
    }
}

import java.util.Scanner;

public class textMain {
    public static void main(String[] args) {
        //创建相关对象
        Scanner scanner = new Scanner(System.in);
        SmallChanageSys oop = new SmallChanageSys();
        int key = 0;

        while (true) {
            oop.mainMenu();
            System.out.println("请输入你的选择(1-4):");
            key = scanner.nextInt();
            switch (key) {

                //零钱通明细
                case 1:
                    oop.detail();
                    break;

                //收益入账
                case 2:
                    oop.income();
                    break;

                //消   费
                case 3:
                    oop.pay();
                    break;

                //退出系统
                case 4:
                    oop.exit();
                    return;

                //输入有误给出提示
                default:
                    System.out.println("菜单项选择有误，请重新输入:");
            }
        }
    }
}