第五天小练习（商品库存管理）

import java.util.Scanner;

public class TestOne {
        public static void main(String[] args) {
            //定义5个数组
            String [] brand  = {"MacBookAir","ThinkPadT450"};
            double [] size = {13.3,15.6};
            double [] price = {9999.99,6666.66};
            int [] count = {0,0};
            while(true) {
            int choose = chooseFunction();
            switch (choose) {
            case 1:
                show(brand, size, price, count);
                break;
            case 2:
                change(brand, count);
                break;
            case 3:
                return;        
            default:
                System.out.println("输入有误没有这个功能");
                break;
            }
            }
            
        }
    //实现用户的选择功能，把功能的需要返回
    public static int chooseFunction() {
        System.out.println(">>>>>>欢迎登陆库存管理系统6.b");
        System.out.println("1.查看商品库存清单");
        System.out.println("2.修改商品库存数量");
        System.out.println("3.退出");
        System.out.println("请输入要执行的操作序号：");
        //接受用户键盘输入
        Scanner sc = new Scanner(System.in);
        int chooseNumber = sc.nextInt();
        return chooseNumber;
    }
    //展示所有库存清单
    public static void show(String[] brand,double [] size,double [] price,int [] count) {
        System.out.println("---------商品库存清单---------");
        System.out.println("品牌型号     尺寸     价格    库存数");
        //定义变量，计算总库存，和总价格
        int totalCount = 0;
        int totalMoney = 0;
        for(int i = 0;i<brand.length;i++) {
            System.out.println(brand[i]+"  "+size[i]+"   "+price[i]+"  "+count[i]);
            totalCount += count[i];
            totalMoney += count[i]*price[i];
        }
        System.out.println("总库存数：" + totalCount);
        System.out.println("商品总金额：" + totalMoney);
    }
    //修改所有商品的库存数量
    public static void change(String[] brand,int [] count) {
        System.out.println("");
        Scanner sc = new Scanner(System.in);
        for(int i = 0;i<brand.length;i++) {
            System.out.println("请输入"+brand[i]+"库存数");
            int userCount = sc.nextInt();
            count[i] = userCount;        
        }        
    }
}