公司面试题（java backend）-设计一个point-of-sale scanning API , 求帮忙

一家不到50人的小公司

Consider a store where items have prices per unit but also volume prices. For example, apples may be $1.00 each or 4 for $3.00.

Implement a point-of-sale scanning API that accepts an arbitrary ordering of products (similar to what would happen at a checkout line) and then returns the correct total price for an entire shopping cart based on the per unit prices or the volume prices as applicable.

Here are the products listed by code and the prices to use (there is no sales tax):

Product Code | Price

A | $2.00 each or 4 for $7.00

B | $12.00

C | $1.25 or $6 for a six pack

D | $0.15

There should be a top level point of sale terminal service object that looks something like the pseudo-code below. You are free to design and implement the rest of the code however you wish, including how you specify the prices in the system:

terminal.setPricing(...) terminal.scan("A") terminal.scan("C") ... etc. result = terminal.total

Here are the minimal inputs you should use for your test cases. These test cases must be shown to work in your program:

Scan these items in this order: ABCDABAA; Verify the total price is $32.40. Scan these items in this order: CCCCCCC; Verify the total price is $7.25. Scan these items in this order: ABCD; Verify the total price is $15.40.

别在小公司浪费时间，题没什么价值

这种题是直接写个code就完了还是需要形成一个小工程文件

1. 
   
2. class Product {
   
3.   private String productName; // or productCode
   
4. 
   
5.   private double unitPrice;
   
6.   private double bulkPrice;
   
7.   private int bulkUnits;
   
8. 
   
9. }
   
10. 
    
11. public class ProductSale {
    
12.   Map<String, Product> products; // key: productName or code, value: Product
    
13. 
    
14.   public double calculatePrice(String shoppingList) {
    
15.         /* separate shopping list to each item
    
16. 
    
17.             put into Map<String, Integer> key as productName value as counts
    
18. 
    
19.             go iterates each key inside Map
    
20. 
    
21.              always try with bulkPrice/bulkUnits first. then apply unitPrice
    
22.              sums up
    
23. 
    
24. 
    
25. 
    
26.              return total;
    
27. 
    
28.        */
    
29. 
    
30.   }
    
31. 
    
32. }
    
33. 
    
34. 
    

复制代码

map存上coupon的细节，然后每次加一个product就去map搜索一下coupon细节 搜索到了看一下满足不满足细节 满足则修改购物车信息。
总的来说就是需要两个map 加一个total price
一个map是 key product value个数 对就是你的购物车
一个map是 key product value list of coupon

.

谢谢各位！用java写完之后被告知要用php写