What is the difference in insertion speed at the beginning between ArrayList and LinkedList?

Inserting an element at the beginning of a collection differs in speed between ArrayList and LinkedList due to their internal implementation:

• ArrayList:

  • Implemented based on an array.
  • Inserting at the beginning requires shifting all existing elements one position to the right.
  • This operation has a time complexity of O(n), where n is the number of elements.

• LinkedList:

  • Implemented as a doubly linked list.
  • Inserting at the beginning is simply creating a new node and reassigning links.
  • The operation is performed in O(1).

Conclusion: If you often need to insert elements at the beginning of a collection, LinkedList will be faster and more efficient than ArrayList. However, for index access, ArrayList is faster as it provides access in O(1), whereas LinkedList access is O(n).