//第一部分
package com.company;

public class Article {
    /**
     * 商品類
     */

    //   名字   單價(jià)    庫存   已賣數(shù)量
       public String name;
       public  double  price;
       public  int   amount;
       public  int  number;


    public void setArticle(String mingzi, double danjia,int kucun,int xiaoshou) {
        name = mingzi;
        price = danjia;
        amount = kucun;
        number = xiaoshou;
    }

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

    }


}


//第二部分
package com.company;

/**
 * 商品集合
 * 倉庫進(jìn)行管理商品
 */
public class ArticleSet {
    Article[] articles=new Article[50];
}


//第三部分

package com.company;

import java.util.Scanner;

public class ArticleManage {
    ArticleSet articleSet=new ArticleSet();
    //倉庫初始化，放入一些商品
    public void  initial(){

     Article xiaomi11 =new Article();

       /**         xiaomi11.name="小米11";
         *         xiaomi11.number=30;
         *         xiaomi11.amount=0;
         *         xiaomi11.price=1999;
         *
         */

        xiaomi11.setArticle("小米11",1999,50,0);

        Article  xiaomipro=new Article();
        xiaomipro.setArticle("小米pro", 2999,60,  1);


        Article  xiaomiultra=new Article();
        xiaomiultra.setArticle("小米u(yù)ltra", 2599,70,  3);


        articleSet.articles[0]=xiaomi11;
        articleSet.articles[1]=xiaomipro;
        articleSet.articles[2]=xiaomiultra;

    }
//啟動(dòng)菜單

    public void startMenu() {
        boolean flag;
        do {
            System.out.println("歡迎使用前臺(tái)商城管理系統(tǒng)");
            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.刪除商品信息");
            System.out.println("4.賣出商品信息");
            System.out.println("5.商品銷售排行榜");
            System.out.println("6.退出");
            System.out.println("------------------------");
            System.out.println("請(qǐng)選擇要執(zhí)行的操作：");
            Scanner scanner = new Scanner(System.in);
           flag=true;
            int num = scanner.nextInt();
            switch (num) {
                case 1:
                    System.out.println("查看商品信息");
                    chaka();
                    break;
                case 2:
                    System.out.println("新增商品信息");
                    add();
                    break;
                case 3:
                    System.out.println("刪除商品信息");
                    delete();
                    break;
                case 4:
                    System.out.println("賣出商品");
                    saleOut();
                    break;
                case 5:
                    System.out.println("商品銷售排行榜");
                    leadeBand();
                    break;
                case 6:
                    System.out.println("謝謝使用");
                    flag=false;
                    break;
                default:
                    System.out.println("你輸入錯(cuò)誤歪架，請(qǐng)?jiān)俅屋斎?);
            }
        }while (flag);
        }



    public void chaka(){
       System.out.println("編號(hào)  \t  名字  \t 單價(jià) \t 庫存  \t  已賣 \t  ");
       for (int i=0; i<articleSet.articles.length;i++){
           if (articleSet.articles[i]!=null) {
             articleSet.articles[i].print(i+1);
           }
       }
    }
    public void add(){
        Scanner scanner =  new Scanner(System.in);
        System.out.println("請(qǐng)輸入商品的名稱");
        String name = scanner.next();
        System.out.println("請(qǐng)輸入價(jià)格");
        double price = scanner.nextDouble();
        System.out.println("請(qǐng)輸入庫存");
        int count = scanner.nextInt();
        System.out.println("請(qǐng)輸入一賣的數(shù)量");
        int number = scanner.nextInt();

        Article newArticle = new Article();
        newArticle.setArticle(name,price,count,number);

        for (int i = 0; i < articleSet.articles.length; i++) {
            if (articleSet.articles[i] == null) {
                articleSet.articles[i] = newArticle; // 把新建的對(duì)象放在數(shù)組中的第一個(gè)空位置
                break; // 后續(xù)的空位置直接跳過
            }
        }
    }
    public void delete(){
      System.out.println("請(qǐng)輸入要?jiǎng)h除的商品編號(hào)");
      Scanner scanner=new Scanner(System.in);
      int bianhao=scanner.nextInt();
      boolean flag =true;
      for (int i=0; i<articleSet.articles.length;i++) {
          if (articleSet.articles[i] != null && (i + 1) == bianhao) {
              int j = i;
              while (articleSet.articles[j + 1] != null) {
                  //后面元素向前移動(dòng)
                  articleSet.articles[j] = articleSet.articles[j + 1];
                  j++;
              }
              articleSet.articles[j] = null;
              flag = true;
              break; //后門的空數(shù)組元素沒有必要執(zhí)行


          } else {
              flag = false;
          }

          }
      }

    public   void saleOut() {
            System.out.println("請(qǐng)輸入要銷售的商品名稱");
            Scanner  scanner=new Scanner(System.in);
            String  mingzi=scanner.next();
            for(int i=0;i<articleSet.articles.length;i++){
                if(articleSet.articles[i]!=null&&articleSet.articles[i].name==mingzi){
                    System.out.println("請(qǐng)輸入賣出數(shù)量");
                    int shuliang=scanner.nextInt();
                    if(shuliang<articleSet.articles[i].amount){
                        articleSet.articles[i].amount=articleSet.articles[i].amount-shuliang;
                        articleSet.articles[i].number=articleSet.articles[i].number+shuliang;
                        System.out.println("成功售出");
                        break;
                    }
                }
            }
        }

    private void leadeBand() {
        for(int i=0; i<articleSet.articles.length-1;i++){
            for(int j=0; j<articleSet.articles.length-i-1;j++){
               if(articleSet.articles[j]!=null&&articleSet.articles[j+1]!=null){//數(shù)組中不為空才能參與
                   if(articleSet.articles[j].number<articleSet.articles[j+1].number){
                       Article newTemp=articleSet.articles[j];
                       articleSet.articles[j]=articleSet.articles[j+1];
                       articleSet.articles[j+1]=newTemp;
                   }
               }
            }
        }
//打印結(jié)果
        for(int i=0;i<articleSet.articles.length;i++){
            if (articleSet.articles[i]!=null){
            System.out.println((i+1)+"\t"+articleSet.articles[i].name+"\t"+articleSet.articles[i].number);
            }
        }

    }
}


//第四部分
package com.company;

public class Demo {
    public static void main(String[] args) {
        ArticleManage articleManage=new ArticleManage();
        articleManage.initial();
        articleManage.startMenu();
        //
    }
}