Adding element in arrayList is in O(1) time but if you are adding more element than the capacity, adding element will be done in O(n) time. Due to random access and underline array, Arraylist can grab element in constant time.It does not allow you to get items by index. ArrayList is one the most common used types in.As with standard linked list and array operations, the various methods will have different algorithmic runtimes.LinkedList implements it with a doubly-linked list with two references maintained for first and last node. ArrayList implements it with a dynamically resizing array.ArrayList and LinkedList are two different implementations of the List interface.
Memory performance: Each element of a LinkedList has more overhead since pointers to the next and previous elements are also stored.Memory performance: It takes up as much memory as is allocated for the capacity, regardless of whether elements have actually been added.Reverse List : O(1), exchange start and end pointers.At end: O(1), could be O (n) if element count will be reached beyond initial capacity after insertion.Underlying data structure : Doubly Linked List.Programming heap : contain actual objects and all are linked by pointers.Programming stack : to keep references of all objects in an array.
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