Difference between ArrayList and LinkedList.

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ArrayList

  • Internally uses a dynamic array to store elements.

  • Provides fast random access (O(1)) because elements are stored in contiguous memory locations and can be accessed by index directly.

  • Insertion or deletion in the middle or beginning is slower (O(n)) since shifting of elements is required.

  • Better suited for scenarios where read operations (searching, accessing by index) are more frequent than modifications.

  • Consumes less memory per element since it only stores the data (plus array overhead).

LinkedList

  • Internally uses a doubly linked list structure (each node stores data plus references to previous and next nodes).

  • Provides faster insertion and deletion (O(1)) at the beginning or middle because no shifting is required, only pointer changes.

  • Accessing elements by index is slower (O(n)) because traversal is needed from the start or end of the list.

  • Better suited for scenarios where frequent add/remove operations are performed, especially at the ends.

  • Consumes more memory per element because of storage of extra pointers (previous and next).

In Essence

  • ArrayList → Best when you need fast access and less modification.

  • LinkedList → Best when you need frequent insertions and deletions.

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