商品管理

articl

package com.company;
public class articl {
    public  String name;   //  商品的名称
    public  int amount ;   //  库存
    public  double price;  //  单价
    public  int number;    //  售出的数量
    public void print(int index){   // 打印：为了便于查看商品的详情
        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 {
    //创建一个实体的仓库对象，并初始化
    ArticleSet articleSet = new ArticleSet();

    // 初始化仓库， 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("小米增强版", 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 删除商品信息");
        System.out.println("4 卖出商品");
        System.out.println("5 排行榜");
        System.out.println("6 退出");
        System.out.println("********************************");

        System.out.println("输入你要执行的功能编号");
        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("删除商品信息");
                delete();
                break;
            case 4:
                System.out.println("卖出商品");
                sell();
                break;
            case 5:
                System.out.println("排行榜");
                leaderboard();
                break;
            case 6:
                System.out.println("感谢使用，已经退出");
                flag = false;
                break;
            default:
                System.out.println("你输入的功能编号有误");
                break;
        }
    } while (flag);

}
public  void  leaderboard() {
    int count = 0 ;
    for (int i = 0 ; i< articleSet.articles.length; i++){
        if ( articleSet.articles[i]!= null){
            count ++;
        }
    }
    // 根据使用的长度临时新建一个数组，这个数组元素存满
    articl[] newTemp = new articl[count];
    // 把旧数组中的元素全部拷贝到新数组中，新数组装满元素
    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){
                // 两个元素交换位置，需要借助第三方临时变量做存储
                articl temp = newTemp[j];
                newTemp[j]= newTemp[j+1];
                newTemp[j+1] = temp;
            }
        }
    }

}

    private void delete() {
        System.out.println("输入你要删掉的商品编号：");
        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("失败");
        }
    }

    public void chakan() {
        System.out.println("编号\t 名称\t 库存\t 单价 \t 出售数量");
        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("请输入商品的名字");
        String name = scanner.next();
        System.out.println("价格：");
        double price = scanner.nextDouble();
        System.out.println("库存");
        int kucun = scanner.nextInt();
        System.out.println("售出数量");
        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("请输入卖出的商品的名字：");
        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 小米增强版
            if (articleSet.articles[i] != null && articleSet.articles[i].name.equals(name)) {
                System.out.println("请输入要卖出的数量：");
                int maichu = scanner.nextInt();
                if (maichu < articleSet.articles[i].amount) {   //卖出数量 < 库存数
                    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("库存不够了");
                }
                break;
            } else {
                flag = false;
                System.out.println("你要卖出的商品没找到");
            }
        }
        if (flag) {
            System.out.println("卖出成功");
        } else {
            System.out.println("卖出失败");
        }
    }
}

ArticleSet

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

Demo

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

    }
}