Avoid implentation types in list parameters

[fsdesa]

Can you change list methods? Change ArrayList by Collection or Iterable interface.
Good work

[kcochibili]

I am not well experienced on Collections, ArrayLists is the List type that I'm familiar with.
If you think Collections would be more efficient, you can fork this project and make modifications. I'll be happy to learn and improve from it.

[gioragutt]

@kcochibili Collection or Iterable aren't collection types, but are interfaces. ArrayList is a specific implementation of a collection, but @maguitoon wants is that the API will not bound users to use one implementation or another, but instead an interface, which will give more flexibility to the users.