[Java Case] Supermarket Shopping

Case introduction:

Write a supermarket shopping program. There are toothbrushes, towels, water glasses, apples and bananas in a supermarket. The user enters the serial number of the product to purchase the product. After the user enters the purchase quantity, he calculates the cost. The user enters "Y" or "N", "Y" means continue to buy, "N" means end of shopping, at this time it is necessary to calculate and output the total money spent on this shopping. Product prices are shown in the table below.

 operation result:

 Full code:

import java.util.Scanner;

public class supermarket {
    public static void main(String[] args)
    {
        Scanner scanner = new Scanner(System.in);
        double toothbrush = 8.8;//牙刷
        double towel = 10;//毛巾
        double cup = 18.8;//水杯
        double apple = 12.5;//苹果
        double banana =15.5;//香蕉
        System.out.println("------------黑马小商城------------");
        System.out.println("1.牙刷的价格为："+toothbrush+"元");
        System.out.println("2.毛巾的价格为："+towel+"元");
        System.out.println("3.水杯的价格为："+cup+"元");
        System.out.println("4.苹果的价格为："+apple+"元");
        System.out.println("5.香蕉的价格为："+banana+"元");
        System.out.println("--------------------------------");
        int item;//购买商品序列号
        int count;//购买商品的数量
        double total = 0;//购买商品总金额
        String good = "商品名";
        String goods = "商品量词";
        double price = 0;
        String choice = "Y";
        do{
            System.out.print("请输入您需要购买商品的序列号：");
            item = scanner.nextInt();
            switch (item)
            {   //将序列号对应的商品名、商品量词、商品价格分别赋值给good、goods、price
                case 1: good = "牙刷";    goods = "把";    price = toothbrush; break;
                case 2: good = "毛巾";    goods = "条";    price = towel;      break;
                case 3: good = "水杯";    goods = "个";    price = cup;        break;
                case 4: good = "苹果";    goods = "斤";    price = apple;      break;
                case 5: good = "香蕉";    goods = "斤";    price =banana;      break;
                default:
                    item=0;//若序列号输入错误，将item赋值为0
                    System.out.println("---------商品序列号输入错误---------");
            }
            if(item!=0) //序列号输入正确，执行if语句
            {   
                System.out.print("请输入您需要购买" + good + "的数量：");
                count = scanner.nextInt();
                total = total + count * price;
                System.out.println("您购买了" + good + count + goods + "，需要花费" + count * price + "元");
            }
            System.out.print("需要继续购买请输入Y，否则输入N：");
            choice = scanner.next();
            
            while(!choice.equals("Y")&&!choice.equals("N"))//若输入字母不为Y或N，则进入while循环
            {
                System.out.println("--------是否继续购买识别失败--------");
                System.out.print("需要继续购买请输入Y，否则输入N：");
                choice = scanner.next();
            }//输入"Y"循环继续，输入"N"循环退出
        }while(choice.equals("Y"));
        System.out.println("您本次购物共花费 "+total+" 元");
        System.out.println("期待您的下次光临！");
    }
}