零钱通案例--JAVA

 

 

 

 

package smallCange;

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

public class smallCangeSys {
    //1.先完成显示菜单，并可以选择菜单，给出对应提示
    //2.完成零钱通明细
    //(1)可以把收益入账和消费保存到数组；(2)可以使用对象；(3)简单的话可以使用String
    //3.完成收益入账--定义新的变量
    //4.完成消费
    //5.退出
    //6.用户输入4退出时，给出提示"你确定退出吗？ y/n",必须输入正确的y/n，否则循环输入指令，直到输入y或n
    public static void main(String[] args) {
        boolean loop = true;
        Scanner scanner = new Scanner(System.in);
        String key = "";
        String details = "----------------零钱通明细-------------";
        double money = 0;
        double balance = 0;
        Date date = null;//date是java.util.Date类型，表示日期
        String note = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
        do {

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

            System.out.println("\t\t\t4 请选择（1-4）");
            key = scanner.next();
            //使用switch分支控制
            switch (key) {
                case "1":
                    System.out.println(details);
                    break;
                case "2":
                    System.out.println("收益入账金额");
                    money = scanner.nextDouble();
                    //找出不正确的金额，把不正确金额的条件写出来,下面的代码就不执行了
                    if(money <= 0){
                        System.out.println("收益入账金额需要大于0");
                        break;
                    }
                    balance += money;
                    date = new Date();//获取当前日期
                    //System.out.println(sdf.format(date));
                    details += "\n收益入账\t+" + money + "\t" + sdf.format(date) + "\t" + balance;
                    break;
                case "3":
                    System.out.println("消费金额");
                    money = scanner.nextDouble();
                    //找出不正确的金额，把不正确金额的条件写出来,下面的代码就不执行了
                    if(money <= 0){
                        System.out.println("您的消费金额应该在0-"+balance);
                        break;
                    }
                    System.out.println("消费说明");
                    note = scanner.next();
                    balance -= money;
                    date = new Date();
                    details += "\n+" + note + "\t-" + money + "\t" + sdf.format(date) + "\t" + balance;
                    break;
                case "4":
                    String choice = "";
                    while (true) {
                        System.out.println("你确定要退出吗 y/n");
                        choice = scanner.next();
                        if ("y".equals(choice) || "n".equals(choice)) {
                            break;
                        }
                    }
//                        if ("y".equals(choice)) {
//                            loop = false;
//                            break;
//                        } else if ("n".equals(choice)) {
//                            break;
//                        }

                    if (choice.equals("y")){
                        loop=false;
                    }
                    break;
                default:
                    System.out.println("====退出了零钱通项目====");
            }
        }while (loop);
    }
}

package smallCange;

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

public class SmallChangeSysOop {
    //将各个功能对应一个方法
    //先完成显示主菜单，并可以选择
    boolean loop = true;
    Scanner scanner = new Scanner(System.in);
    String key = "";
    String details = "----------------零钱通明细-------------";
    double money = 0;
    double balance = 0;
    Date date = null;//date是java.util.Date类型，表示日期
    String note = "";
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");

    //1.先完成显示主菜单，并可以选择
    public void mainMenu(){
        do {

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

            System.out.println("\t\t\t4 请选择（1-4）");
            key = scanner.next();
            //使用switch分支控制
            switch (key) {
                case "1":
                    this.detail();
                    break;
                case "2":
                    this.income();
                    break;
                case "3":
                    this.pay();
                    break;
                case "4":
                    this.exit();
                    break;
                default:
                    System.out.println("====退出了零钱通项目====");
            }
        }while (loop);
    }

    //2.完成零钱通明细
    public void detail(){
        System.out.println(details);
    }
    //3.完成入账
    public void income(){
        System.out.println("收益入账金额");
        money = scanner.nextDouble();
        //找出不正确的金额，把不正确金额的条件写出来,下面的代码就不执行了
        if(money <= 0){
            System.out.println("收益入账金额需要大于0");
            return;//方法不再执行
        }
        balance += money;
        date = new Date();//获取当前日期
        //System.out.println(sdf.format(date));
        details += "\n收益入账\t+" + money + "\t" + sdf.format(date) + "\t" + balance;
    }

    //4.消费
    public void pay(){
        System.out.println("消费金额");
        money = scanner.nextDouble();
        //找出不正确的金额，把不正确金额的条件写出来,下面的代码就不执行了
        if(money <= 0){
            System.out.println("您的消费金额应该在0-"+balance);
            return;
        }
        System.out.println("消费说明");
        note = scanner.next();
        balance -= money;
        date = new Date();
        details += "\n+" + note + "\t-" + money + "\t" + sdf.format(date) + "\t" + balance;
    }

    //5.退出
    public  void exit(){
        String choice = "";
        while (true) {
            System.out.println("你确定要退出吗 y/n");
            choice = scanner.next();
            if ("y".equals(choice) || "n".equals(choice)) {
                break;
            }
        }
        if (choice.equals("y")){
            loop=false;
        }
    }
}

 

package smallCange;

public class SmallChangeSysApp {
    //调用之前编好的程序
    public static void main(String[] args) {
        new SmallChangeSysOop().mainMenu();
    }
}