哪位友友帮我看看怎么写

Question

Answer 1

记得把 Demo 改为你的类名：

import java.util.Scanner;

enum Goods {

    TOOTHBRUSH("牙刷", 1, 8.8),
    TOWEL("毛巾", 2, 10.0),
    WATER_CUP("水杯", 3, 18.8),
    APPLE("苹果", 4, 12.5),
    BANANA("香蕉", 5, 15.5);

    private final String goodName;
    private final int index;
    private final double price;

    Goods(String goodName, int index, double price) {
        this.goodName = goodName;
        this.index = index;
        this.price = price;
    }

    public static double getPrice(int index) {
        for (Goods good : Goods.values()) {
            if (good.index == index) {
                return good.price;
            }
        }
        return 0;
    }
}

public class Demo {

    public static void main(String[] args) {
        double money = 0;
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("是否继续？输入”Y“继续购物，输入”N“退出：");
            if ("Y".equals(scanner.next())) {
                double singlePrice;
                System.out.print("请输入商品编号：");
                singlePrice = Goods.getPrice(scanner.nextInt());
                System.out.print("请输入购买数量：");
                money += singlePrice * scanner.nextInt();
                continue;
            }
            break;
        }
        System.out.println("总共消费：" + money);
    }

}