Java FAQ: Top Questions

ArrayList and LinkedList are two implementations of the List interface, differing in performance and use cases.

• ArrayList:
  • Backed by a dynamic array.
  • Fast for random access ( get , set ) due to indexing (O(1)).
  • Slow for insertions/deletions in the middle (O(n) due to shifting).
  • Memory-efficient for static data.
• LinkedList:
  • Backed by a doubly-linked list.
  • Fast for insertions/deletions (O(1) if position known).
  • Slow for random access (O(n) due to traversal).
  • Uses more memory due to node pointers.