java实现--零钱通

项目说明：

参照微信小程序的零钱通，可以完成收益入账，消费，查看明细，退出系统等功能。

以下是功能模块的具体代码：

import java.text.SimpleDateFormat;
import java.util.Scanner;
import java.util.Date;

public class first {
    public static void main(String[] args) {
        //第一个模块显示菜单
        boolean loop = true;
        double money = 0;//入账金额
        double balance = 0;//余额
        double cost = 0;//消费
        String name;//消费名称
        Date date;
        date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh: mm");

        String details = "----------零钱通明细---------";
        Scanner scan = new Scanner(System.in);


        do {
            System.out.println("----------零钱通菜单---------");
            System.out.println("\t\t\t\t1.零钱通明细\t\t\t\t");
            System.out.println("\t\t\t\t2.收益入账\t\t\t\t");
            System.out.println("\t\t\t\t3.消费\t\t\t\t");
            System.out.println("\t\t\t\t4.退    出\t\t\t\t");

            System.out.println("请选择(1-4):");
            int key = scan.nextInt();

            switch (key) {
                case 1:
                    System.out.println(details + "\n");
                    break;
                case 2:

                    do {
                        System.out.println("请输入入账金额");
                        money = scan.nextDouble();
                        if (money > 0) {
                            balance += money;
                        } else {
                            System.out.println("money输入有误，请重新输入：");
                        }
                    } while (money < 0);


                    details += "\n" + "收益入账\t+" + money + "\t" + sdf.format(date) + "\t" + balance;
                    // System.out.println("---------2.收益入账-----------");
                    break;
                case 3:
                    System.out.println("请输入消费名称：");
                    name = scan.next();
                    do {
                        System.out.println("请输入消费金额：");
                        cost = scan.nextDouble();
                        if (cost > 0) {
                            balance -= cost;
                        } else {
                            System.out.println("cost输入有误，请重新输入：");
                        }
                    } while (cost < 0);
                    details += "\n-" + name + "\t" + cost + "\t" + sdf.format(date) + "\t" + balance;

                    break;
                case 4:
                    System.out.println("你确定要退出吗？y/n");
                    char ans = scan.next().charAt(0);
                    if (ans == 'y') {
                        loop = false;

                    } else if (ans == 'n') {
                        System.out.println("请重新选择(1-4):");
                    } else System.out.println("输入有误，请重新输入：（y/n)");


                    break;
                default:
                    System.out.println("输入有误，请重新输入");
            }


        } while (loop);
        System.out.println("退出零钱通");
    }
}

 部分功能模块代码运行展示：