package com.company;

public class Article {
    public String name;
    public int amount;
    public double price;
    public int number;

    public void print(int index){
        System.out.println(index + "\t" + name + "\t" + price + "\t" + amount + "\t" + number);
    }
}

package com.company;

/**
 * @author dy
 * @date 2021/4/15 9:55
 */
public class ArticleSet {
    Article[] articles = new Article[50];
}

package com.company;

import java.util.Scanner;

/**
 * @author dy
 * @date 2021/4/15 9:55
 */
public class ArticleManage {
    ArticleSet articleSet = new ArticleSet();
    Scanner input = new Scanner(System.in);

    public void initial(){
        Article xiaoMi9 = new Article();
        xiaoMi9.name = "小米9";
        xiaoMi9.price = 2799;
        xiaoMi9.amount = 60;
        xiaoMi9.number = 0;

        Article xiaoMiMIX3 = new Article();
        xiaoMi9.name = "小米mix3";
        xiaoMi9.price = 2049;
        xiaoMi9.amount = 40;
        xiaoMi9.number = 0;

        Article xiaoMiNote7Pro = new Article();
        xiaoMi9.name = "小米Note7Pro";
        xiaoMi9.price = 699;
        xiaoMi9.amount = 80;
        xiaoMi9.number = 0;

        Article xiaoMiPlay = new Article();
        xiaoMi9.name = "小米Play";
        xiaoMi9.price = 749;
        xiaoMi9.amount = 100;
        xiaoMi9.number = 0;

        articleSet.articles[0] = xiaoMi9;
        articleSet.articles[1] = xiaoMiMIX3;
        articleSet.articles[2] = xiaoMiNote7Pro;
        articleSet.articles[3] = xiaoMiPlay;
    }
    public void starMenu(){
        boolean flag = true;
        do {
            System.out.println("欢迎使用超市后台管理系统");
            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：");
            int choice = input.nextInt();
            switch (choice){
                case 1:
                    System.out.println("查看商品信息");
                    break;
                case 2:
                    System.out.println("新增商品信息");
                    break;
                case 3:
                    System.out.println("删除商品信息");
                    break;
                case 4:
                    System.out.println("卖出商品");
                    break;
                case 5:
                    System.out.println("商品销售排行榜");
                    break;
                case 6:
                    System.out.println("谢 谢 使 用！");
                    flag=false;
                    break;
                default:
                    System.out.println("输入不符合要求请重新输入选择！");
                    break;
            }
        }while (flag);
    }
    public void search(){
        System.out.println("编号\t 名称\t 价格\t 库存\t 售出");
        for (int i=0;i<articleSet.articles.length;i++){
            if (articleSet.articles[i]!=null){
                articleSet.articles[i].print(i+1);
            }
        }
    }
    public void add(){
        System.out.println("请输入商品名称：");
        String name = input.next();
        System.out.println("请输入价格：");
        int price = input.nextInt();
        System.out.println("请输入库存：");
        int amount = input.nextInt();
        Article article = new Article();
        article.name=name;
        article.price=price;
        article.amount=amount;
        article.number=0;
        for (int i=0;i<articleSet.articles.length;i++){
            if (articleSet.articles[i]==null){
                articleSet.articles[i]=article;
                break;
            }
        }
    }
    public void delete(){
        System.out.println("请输入商品编号：");
        boolean flag = true;
        int card = input.nextInt();
        for (int i=0;i<articleSet.articles.length;i++){
            if (articleSet.articles[i]!=null&&(i+1)==card){
                int j=i;
                while (articleSet.articles[j+i]!=null){
                    articleSet.articles[j]=articleSet.articles[j+1];
                    j++;
                }
                articleSet.articles[j]=null;
                flag=true;
                break;
            }else{
                flag=false;
            }
        }
        if (flag){
            System.out.println("删除成功！");
        }else {
            System.out.println("删除失败，请重新操作！");
        }
    }
    public void sell(){
        System.out.println("请输入你要卖出的商品名称：");
        String name = input.next();
        boolean flag = true;
        for (int i=0;i<articleSet.articles.length;i++){
            if (articleSet.articles[i]!=null&&articleSet.articles[i].name.equals(name)){
                System.out.println("请输入你要卖出的数量");
                int number=input.nextInt();
                if (number<=articleSet.articles[i].amount){
                    articleSet.articles[i].number = articleSet.articles[i].number+number;
                    articleSet.articles[i].amount = articleSet.articles[i].amount-number;
                    flag=true;
                }
                break;
            }else {
                flag=false;
            }
        }
        if (flag){
            System.out.println("卖出商品成功！");
        }else {
            System.out.println("卖出商品失败");
        }
    }
    public void leaderboard(){
        Article[] articles=new Article[50];
        for (int i=0;i<articles.length;i++){
            if (articleSet.articles[i]!=null){
                articles[i]=articleSet.articles[i];
            }
        }
        for (int i=0;i<articles.length-i-1;i++){
            for (int j=0;j<articles.length-i-1;j++){
                if(articles[j+1]!=null){
                    if (articles[j].number<articles[j+1].number){
                        Article tempArticle = articles[j];
                        articles[j]=articles[j+1];
                        articles[j+1]=tempArticle;
                    }
                }
            }
        }
        System.out.println("**************************");
        System.out.println("名次\t销售数量\t商品名称");
        for (int i=0;i<articles.length;i++){
            if (articles[i]!=null){
                System.out.println(i+1+"\t"+articles[i].number+"\t"+articles[i].name);
            }
        }
    }
}

package com.company;

/**
 * @author dy
 * @date 2021/4/15 10:20
 */
public class Demo {
    public static void main(String[] args) {
        ArticleManage articleManage = new ArticleManage();
        articleManage.initial();
        articleManage.starMenu();
    }
}