Bagaimana untuk melaksanakan Lingqiantong di Jawa

Gambar:

Berfikir:

(1) Anda boleh merekod dan menggunakan pendapatan dan menyimpannya dalam tatasusunan (tetapi tatasusunan yang telah anda pelajari setakat ini adalah panjang tetap)

(2) Anda boleh menggunakan objek

(3) Anda boleh menggunakan Penyambungan rentetan

Lengkapkan kemasukan hasil dan lengkapkan kod yang mendorong pengaturcara menambah perubahan baharu

(1) Jumlah yang akan diterima dan baki dikemas kini

( 2) Sambungkan aksara bersama Rentetan

(3) Cari cara untuk mengeluarkan masa dan ubah suai format outputnya

Sambungan rentetan yang saya gunakan

Beberapa arahan

Buat pakej com.project.money.oop

dan kemudian buat dua kelas SmallChangeSys dan SmallChangeSysOOP

SmallChangeSys digunakan untuk menulis kaedah utama kod seperti berikut

package com.project.money.oop;

public class SmallChangeSys {
    public static void main(String[] args) {
        SmallChangeSysOOP p=new SmallChangeSysOOP();
        p.menu();
    }
}

SmallChangeSysOOP digunakan untuk melaksanakan fungsi tertentu

Kod adalah seperti berikut:

package com.project.money.oop;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
public class SmallChangeSysOOP {
    private  double in_money=0;//当前流动的钱
    private double balance=0;//余额
    private String detailed="------------零钱通明细--------------";
    private Date date = null;
    //可以用于日期格式化的
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
public void menu(){};
//1 零钱通明细
 public void detailed_(){};
 //2 收益入账"
 public void input(){};
 //3消费
    public void output(){};

}

Butiran peranan setiap kaedah:

kaedah public void() method

public void menu(){//菜单
        boolean loop=true;
        Scanner scanner = new Scanner(System.in);
        while(loop){//循环展示菜单
            System.out.println("\n============oop零钱通菜单==============");
            System.out.println("\t\t1 零钱通明细");
            System.out.println("\t\t2 收益入账");
            System.out.println("\t\t3 消费");
            System.out.println("\t\t4 退" + "\t" + "出");
            System.out.print("请选择1-4:");int key= scanner.nextInt();//选择；
            switch (key){
                case 1:detailed_();break;
                case 2:input();break;
                case 3:output();break;
                case 4:System.out.println("\t\t程序已经退出");loop=false;break;
            }

        }
    }

void detailed_() method

public void detailed_(){
        System.out.println(detailed);//直接输出字符
    }

public void input() method

public void input(){//收益入账
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入金额：");
        this.in_money=scanner.nextDouble();

        while(in_money<0){
            System.out.println("======输入有误======");
            System.out.println("是否重新输入？Y（是）或 N（否） ");//可能点错了不是输入
            String in=scanner.next();//是否重新输入
            if(in.equals("n")||in.equals("N")){
                System.out.println("返回主页面中....");
                /*****************************************/
                try {
                    Thread.sleep( 1000 );//暂停1秒提升用户感受
                } catch (Exception e){}
                /*******************************************/
                return;//退出输入
            }

                System.out.println("请输入金额：");
                this.in_money=scanner.nextDouble();
        }
        this.balance+=this.in_money;
        String beizhu="";
        date = new Date();
        System.out.println("请输入备注：");
        beizhu=scanner.next();
        this.detailed+="\n收益入帐\t+" + this.in_money + "\t" + sdf.format(date) +
                "\t余额：" + this.balance+ "  备注：" +beizhu;
    }

public void kaedah output()

 public void output(){
        System.out.println("请输入金额：");
        Scanner scanner = new Scanner(System.in);
        in_money=scanner.nextDouble();
        if(balance<in_money){
            System.out.println("余额不足，请充值");
            return;
        }
        while(in_money<0){
            System.out.println("输入错误，请重输");
            in_money=scanner.nextDouble();
            if(balance<in_money){
                System.out.println("余额不足，请充值");
                return;
            }
        }
        this.balance-=in_money;
        System.out.println("请输入备注：");
        String beizhu=scanner.next();
        this.detailed+="\n余额支出\t-" + this.in_money + "\t" + sdf.format(date) +
                "\t余额：" + this.balance+ "  备注：" +beizhu;

    }

SmallChangeSysOOP Kod lengkap

package com.project.money.oop;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
public class SmallChangeSysOOP {
    private  double in_money=0;//当前流动的钱
    private double balance=0;//余额
    private String detailed="------------零钱通明细--------------";
    private Date date = null;
    //可以用于日期格式化的
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");

    public void menu(){//菜单
        boolean loop=true;
        Scanner scanner = new Scanner(System.in);
        while(loop){//循环展示菜单
            System.out.println("\n============oop零钱通菜单==============");
            System.out.println("\t\t1 零钱通明细");
            System.out.println("\t\t2 收益入账");
            System.out.println("\t\t3 消费");
            System.out.println("\t\t4 退" + "\t" + "出");
            System.out.print("请选择1-4:");int key= scanner.nextInt();//选择；
            switch (key){
                case 1:detailed_();break;
                case 2:input();break;
                case 3:output();break;
                case 4:System.out.println("\t\t程序已经退出");loop=false;break;
            }

        }
    }
    //1 零钱通明细
    public void detailed_(){
        System.out.println(detailed);
    }
    //2 收益入账"
    public void input(){//收益入账
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入金额：");
        this.in_money=scanner.nextDouble();

        while(in_money<0){
            System.out.println("======输入有误======");
            System.out.println("是否重新输入？Y（是）或 N（否） ");//可能点错了不是输入
            String in=scanner.next();//是否重新输入
            if(in.equals("n")||in.equals("N")){
                System.out.println("返回主页面中....");
                /*****************************************/
                try {
                    Thread.sleep( 1000 );//暂停1秒提升用户感受
                } catch (Exception e){}
                /*******************************************/
                return;//退出输入
            }

                System.out.println("请输入金额：");
                this.in_money=scanner.nextDouble();
        }
        this.balance+=this.in_money;
        String beizhu="";
        date = new Date();
        System.out.println("请输入备注：");
        beizhu=scanner.next();
        this.detailed+="\n收益入帐\t+" + this.in_money + "\t" + sdf.format(date) +
                "\t余额：" + this.balance+ "  备注：" +beizhu;
    }
    //3消费
    public void output(){
        System.out.println("请输入金额：");
        Scanner scanner = new Scanner(System.in);
        in_money=scanner.nextDouble();
        if(balance<in_money){
            System.out.println("余额不足，请充值");
            return;
        }
        while(in_money<0){
            System.out.println("输入错误，请重输");
            in_money=scanner.nextDouble();
            if(balance<in_money){
                System.out.println("余额不足，请充值");
                return;
            }
        }
        this.balance-=in_money;
        System.out.println("请输入备注：");
        String beizhu=scanner.next();
        this.detailed+="\n余额支出\t-" + this.in_money + "\t" + sdf.format(date) +
                "\t余额：" + this.balance+ "  备注：" +beizhu;

    }


}

Beberapa gambar

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