Edit Value of a Key in a LinkedHashMap inside an ArrayList that’s inside another LinkedHashMap

Question

Let's say I have the following data structure like this:

LinkedHashMap<String, ArrayList<LinkedHashMap>> foodFamilies = new LinkedHashMap<>(); 

that looks something like this:

{Fruit = [{Name = Apple, 
 Color = }, 
 {Name = Cherry, 
 Color = }], 
 Vegetables = [{Name = Beet,
 Color = }]}

How can I elegantly insert the color "red" for every color of every food in each family?

• chrylis -cautiouslyoptimistic-: Refactor to use a Food class, then use a stream or Groovy closure iterator?

Answer 1

You can do it like this:

for (List<LinkedHashMap> list : foodFamilies.values())
 for (LinkedHashMap map : list)
 map.put("Color", "red");

By the way, you should not use the raw type LinkedHashMap. It should be a LinkedHashMap<String, String> (I think).

I also think that you should be using a class with two fields name and color rather than a Map anyway.