[Java知识库]用java面向对象写一个简单的增加查询

用java面向对象写一个简单的增加查询

功能是实现不是很标准，有空再改改

package SourceCode.OOP;

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

public class MenuOOP {
    /*
    完成功能：
    1、显示菜单，并且可以选择
    2、完成零钱通明细
    3、完成收益入账
    4、消费
    5、退出
    ----------------菜单----------------
            1 零钱通明细
            2 收益入账
            3 消费
            4 退出
     ----------------零钱通明细----------------
     收益入账 +100 time  余额：100.0
     收益入账 +100 time  余额：100.0
     真功夫
     */




    Scanner scanner = new Scanner(System.in);
    boolean loop = true;
    double Earnings = 0;//入账金额；
    double balance = 0; //余额；
    double pay = 0;//支出金额；
    String details ;
    String Cons = null;
    SimpleDateFormat ChinaTime = new SimpleDateFormat("yyyy-MM-dd HH:mm");
    Date date = new Date();


    public  void selectMenu(){
        do{
        System.out.println("\n----------------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("请输入(1-4): ");
        String menu = scanner.next();
            switch (menu){
                case "1":{
                    this.Detail();
                    break;
                }
                case "2":{
                this.EarningsBooked();
                    break;
                }
                case "3":{
                this.Consumption();
                    break;
                }
                case "4":{
                    this.Exit();
                    loop = false;
                        break;
                }
            }
        }while (loop);

    }
    public  void Detail(){//零钱通明细
        System.out.println( "----------------零钱通明细----------------");
        System.out.println("");
        System.out.println(details);

    }
    public  void Consumption(){//消费
        System.out.println("请输入消费用于：");
        Cons = scanner.next();
        System.out.println("请输入消费了多少钱：");
        pay = scanner.nextDouble();
        balance = balance - pay;
        details += "\n"+Cons + "\t" +ChinaTime.format(date)+ "\t"+ "余额：" + balance;
        System.out.println();
        System.out.println(details );


    }
    public  void EarningsBooked(){//收益入账
        System.out.println("请输入入账金额： ");
        Earnings = scanner.nextDouble();
        balance += Earnings;
        details += "\n收益： " +"+"+Earnings+"\t\t" +ChinaTime.format(date)+"\t"+"余额: "+balance;
        System.out.println();
        System.out.println(details);



    }
    public void Exit(){
        System.out.println("退出成功-------");

    }
}

实现类

package SourceCode.OOP;

public class MenuOOP_Main {
    public static void main(String[] args) {
        MenuOOP menuOOP = new MenuOOP();
        menuOOP.selectMenu();


    }
}

运行结果：

"C:\Program Files\Java\jdk1.8.0_191\bin\java.exe" "-javaagent:C:\Users\滔\Desktop\暑假实训\idea\IntelliJ IDEA 2020.2\lib\idea_rt.jar=52651:C:\Users\滔\Desktop\暑假实训\idea\IntelliJ IDEA 2020.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_191\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\rt.jar;C:\Users\滔\IdeaProjects\Test1\out\production\Test1" SourceCode.OOP.MenuOOP_Main

----------------菜单----------------
			1 零钱通明细
			2 收益入账
			3 消费
			4 退出
请输入(1-4): 
3
请输入消费用于：
3
请输入消费了多少钱：
3

null
3	2021-08-26 23:30	余额：-3.0

----------------菜单----------------
			1 零钱通明细
			2 收益入账
			3 消费
			4 退出
请输入(1-4): 

3
请输入消费用于：
3
请输入消费了多少钱：
3

null
3	2021-08-26 23:30	余额：-3.0
3	2021-08-26 23:30	余额：-6.0

----------------菜单----------------
			1 零钱通明细
			2 收益入账
			3 消费
			4 退出
请输入(1-4): 
4
退出成功-------