java arraylist ensureCapacity not working

Question

Either I\'m doing this wrong or i\'m not understanding how this method works.

ArrayList a = new ArrayList();
a.ensureCapacity(200         


        

Answer 1

Adding 190 null entries to an ArrayList reeks of a misuse of the data structure.

1. Think about using a standard primitive array.

2. If you require a generics or want more efficient use of space then consider SparseArray or even a Map like a HashMap may be appropriate for your purposes.