如何将多个列表分配给对象的属性？

Question

I have a product object that has a number of properties like this

public class Product {
     private int deal_id;
     private String deal_key;
     private String deal_title;
     private String url_title;
     private int deal_value;
.........//setters and getters
}

Every product has a number of sizes that can also be 0. I want to assign sizes to my product from values in the json data I receive(below). I am extending this class and now I need to add another property of size which is an array of arrays. I need to set it from json on the api that like this.

"size" : [ { "product_size_id": "695", "deal_id": "179", "size_name": "None", "quantity": "1", "size_id": "1" }, 
           { "product_size_id": "695", "deal_id": "179", "size_name": "None", "quantity": "1", "size_id": "1" } ]

How can I set this on my product object in JAVA. I have tried looking up Hashmaps and Arraylist but havent found a way to do it correctly.

Answer 1

You can create an object for Size with all your properties

public class Size {
    private int product_size_id;
    private int deal_id;
    private String size_name;
    private int quantity;
    private int size_id;
....setters and getters
}

Then you can set size as object and add it to Product as a List

private ArrayList<Size> yoursizes;

Answer 2

Two things that may help to find a solution to your problem.

First you may want to parse the JSON input. This answer may help you to get this done.

Second I think you need a data structure that allows to assign multiple lists to a value (or something similar). There are libraries for Java to help you do this. Guava or Commons Collections are two examples.