idea-java 商店管理系统

详细步骤概述

步骤一：创建类Main

package edu.xcdq;
/**
 * 商品类
 */
public class Main {
    // 名字 单价 库存 已卖数量
    public String name;
    public double price;
    public int amount;
    public int number;
    /*
    1.  商品展示
     */
    public void print(int index) {
        System.out.println(index + "\t" + name + "\t" + price + "\t" + amount + "\t" + number);
    }
    public void setArticle(String mingzi , double danjia, int kucun,int yishou){
        name=mingzi;
        price=danjia;
        amount = kucun;
        number = yishou;
    }
}

步骤二：创建类Main1

package edu.xcdq;
/**
 * @author WYP
 * @date 2021/4/6 14:30
 */
/*
    2.商品集合类
 */
public class Main1 {
    Main[] articles= new Main[38];
}

步骤三：创建类Main2
Main内包含 initial、startMenu

package edu.xcdq;

import java.util.Scanner;

/**
 * @author WYP
 * @date 2021/4/6 14:30
 */
public class Main2 {
    Main1 main = new Main1();
    Scanner input = new Scanner(System.in);
    /**
     * 3.   初始化商品
     */

    public void initial(){
        Main xiaomi12 = new Main();
        /*
        xiaomi9.name = "小米12";
        xiaomi9.price = 4999;
        xiaomi9.amount = 30;
        xiaomi9.number = 8;
        */
        xiaomi12.setArticle("小米12",4999,30,8);
        Main xiaomi11 = new Main();
        xiaomi11.setArticle("小米11",3999,30,10);
        Main redmi10pro = new Main();
        redmi10pro.setArticle("Redmi10por",2999,30,0);
        Main redmi9 = new Main();
        redmi9.setArticle("Redmi9",1999,30,0);



        main.articles[0] = xiaomi12;
        main.articles[1] = xiaomi11;
        main.articles[2] = redmi10pro;
        main.articles[3] = redmi9;

    }
    public void startMenu() {
        boolean falg = true;
        do {
            System.out.println("欢迎使用前程商城后台管理系统");
            System.out.println("--------------------------------------------");
            System.out.println("1. 查看商品信息");
            System.out.println("2. 新增商品信息");
            System.out.println("3. 删除商品信息");
            System.out.println("4. 卖出商品");
            System.out.println("5. 商品销售排行榜");
            System.out.println("6. 退出");
            System.out.println("--------------------------------------------");
            System.out.println("请选择要执行的操作编号：");
            int choice = input.nextInt();
            switch (choice){
                case 1:
                    System.out.println("查看商品信息");
                    chakan();
                    break;
                case 2:
                    System.out.println("新增商品信息");
                    add();
                    break;
                case 3:
                    System.out.println("删除商品信息");
                    delete();
                    break;
                case 4:
                    System.out.println("卖出商品");
                    saleOut();
                    break;
                case 5:
                    System.out.println("商品销售排行榜");
                    leaderBand();
                    break;
                case 6:
                    System.out.println("谢 谢 使 用 ！");
                    falg = false;
                    break;
                default:
                    System.out.println("输入不符合要求请重新选择！");
                    break;
            }
        }while (falg);
    }


    public void chakan(){
        System.out.println("编码 \t 名称\t单价\t库存\t售出数量");
        for (int i = 0; i < main.articles.length; i++) {
            if (main.articles[i] !=null){
                main.articles[i].print(i+1);
            }
        }
    }
    public void add(){
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入商品名称：");
        String name = scanner.next();
        System.out.println("请输入单价：");
        int price = input.nextInt();
        System.out.println("请输入库存：");
        int amount = input.nextInt();
        System.out.println("请输入已卖数量：");
        int number = scanner.nextInt();

        Main mainn = new Main();
        mainn.setArticle(name,price,amount,number);
        for (int i = 0; i < main.articles.length; i++) {
            if (main.articles[i] == null){
                main.articles[i] = mainn;
                break;
            }
        }
    }
    private void delete() {
        System.out.println("请输入要删除的商品编码：");
        Scanner input = new Scanner(System.in);
        int delNo = input.nextInt();
        boolean flag = true;
        for (int i = 0; i < main.articles.length; i++) {
            if (main.articles[i] != null && (i+1) ==delNo){
                int j = i;
                while (main.articles[j+1] !=null){
                    main.articles[j] = main.articles[j+1];
                    j++;
                }
                main.articles[j] = null;
                flag = true;
                break;//后续的空数组元素没有必要执行
            }else {
                flag = false;
            }
        }
        if (flag){
            System.out.println("删除成功");
        }else {
            System.out.println("删除失败!");
        }
    }
    private void saleOut() {
        System.out.println("请输入您要买出的商品的名字：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.next();
        boolean flag = true;

        for (int i = 0; i < main.articles.length; i++) {
            if (main.articles[i] != null && main.articles[i].name.equals(name) ){
                System.out.println("请输入要卖出的数量：");
                int maichu = scanner.nextInt();
                if (maichu

步骤四：创建类main3

package edu.xcdq;
/**
 * @author WYP
 * @date 2021/4/6 14:30
 */
/*
    4.  菜单切换
 */
public class Main3 {
    public static void main(String[] args) {
        Main2 main2 = new Main2();
        main2.initial();
        main2.startMenu();
    }
}

运行结果：

image.png