GoodsManager2.java

package justdo;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Scanner;

/**
 * @author Pandy
 * @date 2018/5/5 16:05
 */
public class GoodsManager2 {
    public static void main(String[] args) {

        ArrayList<Goods>list = new ArrayList<Goods>();
        addGoods(list);


        while(true){
            int choose = chooseFunction();
            switch (choose){
                case 1:
                    printStore(list);
                    break;
                case 2:
                    update(list);
                    break;
                case 3:
                    exit();
                    return;
                    default:
                        System.out.println("===========");
                        System.out.println("请输入正确的序号！");
                        break;
            }
        }

    }
    public static void printStore(ArrayList<Goods> list){
        int totalCount = 0;
        double totalMoney = 0;
        System.out.println("--------------------查看库存-------------");
        System.out.println("品牌"+"  " +"尺寸" +"  "+"价格"+"  "+"数量");
        for (int i = 0;i<list.size();i++){
            Goods item = list.get(i);
            System.out.println(item.brand+"  " +item.size + "  " + item.price+"  "+item.count);
            totalCount += item.count;
            totalMoney += item.price;
        }
        System.out.println("总的库存是："+totalCount);
        System.out.println("总的金额是："+totalMoney);
    }



    public static void update(ArrayList<Goods> list) {

        System.out.println("======修改库存数量==========");
        for (int i = 0;i<list.size();i++){
            Goods item = list.get(i);
            System.out.println("请输入" + item.brand + "商品库存");
            item.count = new Scanner(System.in).nextInt();
            list.set(i,item);
        }





    }


    public static void exit(){
        System.out.println("====================退出====================");
        System.out.println("您已经退出系统！");
    }


    public static void addGoods(ArrayList<Goods>list){
       Goods g1 = new Goods();
       Goods g2 = new Goods();

       g1.brand = "ThinkPad";
       g1.size = 5.99;
       g1.price = 9999;
       g1.count = 10;

       g2.brand = "Apple";
       g2.size = 6.00;
       g2.price = 8888;
       g2.count = 1;

       list.add(g1);
       list.add(g2);


    }











    public static int chooseFunction(){
        System.out.println("====================库存管理=================");
        System.out.println("1.查看库存清单");
        System.out.println("2.修改商品库存的数量");
        System.out.println("3.退出");
        System.out.println("请输入要执行的序列号");

        Scanner in = new Scanner(System.in);
        int choose = in.nextInt();
        return choose;
    }





}