Question

i need to make an array of arraylists of an object.

i have tried two ways , but i can’t access object’s properties from the array elements.

i’ve tried :

     ArrayList<Word>[] SubList = (ArrayList<Word>[])new ArrayList(MainList.size()); 

AND :

    ArrayList<Word>[] SubList= new ArrayList[MainList.size()];

AND:

           ArrayList<Word>[] SubList= (ArrayList<Word> [])new ArrayList[MainList.size()];

What i would like to do is to call a method from the object inside the array

like this :

    SubList[0].get(0).method();

Thanks In Advance

Answer 1

To avoid working with low level Arrays and to preserve type safety, you could make a list of a list

List<List<Word>> listOfList = 
         new ArrayList<List<Word>>(new ArrayList<List<Word>>());

Which you then could access like

Word word = listOfList.get(0).get(0);