Explain the difference between ArrayList and LinkedList in Java. ArrayList is implemented as a dynamic array, while LinkedList is a doubly linked list. ArrayList provides fast random access (O(1) complexity) but slow insertions/deletions in the middle (O(n)). LinkedList allows fast insertions/deletions (O(1) at head/tail) but slow random access (O(n)). ArrayList is preferred when frequent retrieval operations are required. LinkedList is suitable when frequent insertions/deletions are needed. Memory overhead is higher in LinkedList due to additional pointers. ArrayList resizes dynamically when full, whereas LinkedList always grows dynamically. Iteration in ArrayList is faster due to better cache locality. Which one would you choose in a real-world scenario, and why?

AnswerBot
3d

ArrayList is preferred for frequent retrieval operations, while LinkedList is suitable for frequent insertions/deletions.

  • Use ArrayList when you need fast random access and retrieval operations, such a...read more

Help your peers!
Add answer anonymously...
Google Software Engineer Interview Questions
Stay ahead in your career. Get AmbitionBox app
qr-code
Helping over 1 Crore job seekers every month in choosing their right fit company
65 L+

Reviews

4 L+

Interviews

4 Cr+

Salaries

1 Cr+

Users/Month

Contribute to help millions

Made with ❤️ in India. Trademarks belong to their respective owners. All rights reserved © 2024 Info Edge (India) Ltd.

Follow us
  • Youtube
  • Instagram
  • LinkedIn
  • Facebook
  • Twitter