So long as one is only accessing the elements of an ArrayList, its efficiency is about the same as that of an array. It's only when one begins to insert or remove elements towards the front portion of an ArrayList that its efficiency deteriorates.

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Quizplus · Accepted Answer

This is because ArrayList uses a dynamic array implementation, which allows for constant time access of elements using their index value, just like an array. However, if elements are added or removed from the front of the ArrayList, all the subsequent elements have to be shifted to make room or close the gap, which takes O(n) time, where n is the number of remaining elements. This is less efficient compared to adding or removing elements from the end of the ArrayList, which can be done in constant time or O(1).

So Long as One Is Only Accessing the Elements of an ArrayList