Articl

package com.company;
public class Articl {
    public  String name;   //  商品的名稱(chēng)
    public  int amount ;   //  庫(kù)存
    public  double price;  //  單價(jià)
    public  int number;    //  售出的數(shù)量
    public void print(int index){   // 打印：為了便于查看商品的詳情
        System.out.println(index+"\t"+ name + "\t" +amount +"\t" +price + "\t"+ number );
    }
    // 起始化商品信息
    public  void  setArticle(String mingzi, int kucun, double danjia, int shouchu){
        name = mingzi;
        amount = kucun;
        price = danjia;
        number = shouchu;
    }
}

ArticleManage

package com.company;

import java.util.Scanner;

public class ArticleManage {
    //創(chuàng)建一個(gè)實(shí)體的倉(cāng)庫(kù)對(duì)象，并初始化
    ArticleSet articleSet = new ArticleSet();

    // 初始化倉(cāng)庫(kù)， 放入起始商品
    public void initial() {
        articl xiaomi11 = new articl();
        xiaomi11.setArticle("小米11", 30, 1999, 0);
        articl xiaomi11pro = new articl();
        xiaomi11pro.setArticle("小米11pro", 40, 2999, 0);
        articl xiaomiUltra = new articl();
        xiaomiUltra.setArticle("小米增強(qiáng)版", 50, 3999, 0);

        articleSet.articles[0] = xiaomi11;
        articleSet.articles[1] = xiaomi11pro;
        articleSet.articles[2] = xiaomiUltra;
    }

    public void startMenu() {
        boolean flag = true;
        do {
            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(mài)出商品");
            System.out.println("5 排行榜");
            System.out.println("6 退出");
            System.out.println("********************************");

            System.out.println("輸入你要執(zhí)行的功能編號(hào)");
            Scanner scanner = new Scanner(System.in);
            int gongnengBianhao = scanner.nextInt();
            switch (gongnengBianhao) {
                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("刪除商品信息");
                    delete();
                    break;
                case 4:
                    System.out.println("賣(mài)出商品");
                    sell();
                    break;
                case 5:
                    System.out.println("排行榜");
                    leaderboard();
                    break;
                case 6:
                    System.out.println("感謝使用，已經(jīng)退出");
                    flag = false;
                    break;
                default:
                    System.out.println("你輸入的功能編號(hào)有誤");
                    break;
            }
        } while (flag);

    }
    public  void  leaderboard() {
        int count = 0 ;
        for (int i = 0 ; i< articleSet.articles.length; i++){
            if ( articleSet.articles[i]!= null){
                count ++;
            }
        }
        // 根據(jù)使用的長(zhǎng)度臨時(shí)新建一個(gè)數(shù)組，這個(gè)數(shù)組元素存滿
        articl[] newTemp = new articl[count];
        // 把舊數(shù)組中的元素全部拷貝到新數(shù)組中，新數(shù)組裝滿元素
        for (int i =0 ; i< count ; i ++) {
            newTemp[i] = articleSet.articles[i];
        }

        for ( int i= 0 ; i< newTemp.length; i++){
            for ( int j = 0 ; j < newTemp.length -j ; j++){
                if (newTemp[j].number< newTemp[j+1].number){
                    // 兩個(gè)元素交換位置，需要借助第三方臨時(shí)變量做存儲(chǔ)
                    articl temp = newTemp[j];
                    newTemp[j]= newTemp[j+1];
                    newTemp[j+1] = temp;
                }
            }
        }

    }

    private void delete() {
        System.out.println("輸入你要?jiǎng)h掉的商品編號(hào)：");
        Scanner scanner = new Scanner(System.in);
        int delNo = scanner.nextInt();
        boolean flag = true;
        for (int i = 0; i < articleSet.articles.length; i++) {
            if ((delNo == (i + 1)) && (articleSet.articles[i] != null)) {
                int j = i;
                while (articleSet.articles[j + 1] != null) {
                    articleSet.articles[j] = articleSet.articles[j + 1];
                    j++;
                }
                articleSet.articles[j] = null;
                flag = true;
                break;
            } else {
                flag = false;
            }
        }
        if (flag) {
            System.out.println("成功");
        } else {
            System.out.println("失敗");
        }
    }


    public void chakan() {
        System.out.println("編號(hào)\t 名稱(chēng)\t 庫(kù)存\t 單價(jià) \t 出售數(shù)量");
        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)輸入商品的名字");
        String name = scanner.next();
        System.out.println("價(jià)格：");
        double price = scanner.nextDouble();
        System.out.println("庫(kù)存");
        int kucun = scanner.nextInt();
        System.out.println("售出數(shù)量");
        int number = scanner.nextInt();

        articl articl = new articl();
        articl.setArticle(name, kucun, price, number);
        for (int i = 0; i < articleSet.articles.length; i++) {
            if (articleSet.articles[i] == null) {
                articleSet.articles[i] = articl;
                break;
            }
        }

    }

    public void sell() {
        System.out.println("請(qǐng)輸入賣(mài)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 < articleSet.articles.length; i++) {   //小米11  小米11pro 小米增強(qiáng)版
            if (articleSet.articles[i] != null && articleSet.articles[i].name.equals(name)) {
                System.out.println("請(qǐng)輸入要賣(mài)出的數(shù)量：");
                int maichu = scanner.nextInt();
                if (maichu < articleSet.articles[i].amount) {   //賣(mài)出數(shù)量 < 庫(kù)存數(shù)
                    articleSet.articles[i].amount = articleSet.articles[i].amount - maichu;
                    articleSet.articles[i].number = articleSet.articles[i].number + maichu;
                    flag = true;
                } else {
                    flag = false;
                    System.out.println("庫(kù)存不夠了");
                }
                break;
            } else {
                flag = false;
                System.out.println("你要賣(mài)出的商品沒(méi)找到");
            }
        }
        if (flag) {
            System.out.println("賣(mài)出成功");
        } else {
            System.out.println("賣(mài)出失敗");
        }
    }
}

ArticleSet

public class ArticleSet {
articl[]  articles =  new articl[30];
}

Dome

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

    }
}