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?

Refactor to use a Food class, then use a stream or Groovy closure iterator? — chrylis -cautiouslyoptimistic-
– chrylis -cautiouslyoptimistic-, Commented Oct 7, 2015 at 0:52

Paul Boddington · Accepted Answer · 2015-10-07 00:54:14Z

2

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.

answered Oct 7, 2015 at 0:54

Paul Boddington

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