用HashSet模拟一个网上购物车

Question

用HashSet模拟一个网上购物车。要求：从键盘输入5个商品的编号、名称、单价、购买数量，将这些信息存入一个HashSet，（如果编号相同，则可以在数量上加1，不能重复存入购物车）然后将该HashSet作为参数调用方法getSum（HashSet items），该方法用于计算商品的总价并返回。

Answer 1

import java.util.HashMap;
import java.util.Scanner;
class books
{
    String name;
    double price;
    int number;
}
public class bookshop {
    static double getSum(HashMap<Integer, books> books)
    {
        books b=new books();
        double s=0;
        for(int i=0;i<books.size();i++)
        {
            b=(books) books.get(i);
            s+=(b.price*b.number);
        }
        return s;
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        HashMap<Integer, books> m=new HashMap<Integer, books>();
        Scanner sc=new Scanner(System.in);
        books books=new books();
        System.out.print("Please input the book`s number:");
        int n=sc.nextInt();
        for(int i=0;i<n;i++)
        {
            System.out.println("Please input the "+(i+1)+" th book`s name:");
            books.name=sc.next();
            System.out.print("Please input the "+(i+1)+" th book`s price:");
            books.price=sc.nextDouble();
            System.out.print("Please input the "+(i+1)+" th book`s number:");
            books.number=sc.nextInt();
            m.put(i, books);
        }
        double s=getSum(m);
        System.out.print("The total prices of books is:"+s);
    }

}

https://blog.csdn.net/waitig1992/article/details/12883685