GoodsManager.java

package justdo;
import java.util.*;
/**
 * @author Pandy
 * @date 2018/5/5 11:12
 */
public class GoodsManager {
    public static void main(String[] args) {

        String[] brand = {"Lenove","ThinkPad","Apple"};
        double size[] = {5.99,6.00,5};
        double price[] = {999,888,666};
        int count[] = {10,10,10};




        while(true){
            printSystem();
            int num = new Scanner(System.in).nextInt();
            switch(num){
                case 1:
                    System.out.println("商品总目目录如下：");
                    printGoods(brand,size,price,count);
                    break;
                case 2:
                    System.out.println("修改");
                    changeCoods(brand,count);
                    break;
                case 3:
                    System.out.println("退出程序");
                    return;
                    default:
                        System.out.println("您输入的序号有误！请重新输入！");
            }
        }
    }


    public static void printGoods(String[] brand,double[] size,double[] price,int[] count){
        int allMoney = 0;
        int allCount = 0;
        System.out.println("商标" + "    " + "尺寸" + "    " + "价格" + "    " + "数量");
        for (int i = 0;i<brand.length;i++){

            System.out.println(brand[i] + "    " + size[i] + "    " +price[i] + "    " +count[i] + "\t");
            allMoney += count[i]*price[i];
            allCount += count[i];
        }


        System.out.println("============================");
        System.out.println("总数量：" + allCount);
        System.out.println("总金额：" + allMoney);


    }

    public static void changeCoods(String[] brand,int[] count){
        for (int i = 0;i<brand.length;i++){
            System.out.println("请输入" + brand[i] + "的数量");
            Scanner scan = new Scanner(System.in);
            int newCount = scan.nextInt();
            count[i] = newCount;
        }



    }



    //public

    public static void printSystem(){
        System.out.println("======================");
        System.out.println("1.查询总的商品目录");
        System.out.println("2.修改商品目录");
        System.out.println("3.退出程序");
        System.out.println("请输入要选择的序号：");
    }
}