Explain HashMap internals and collisions

Q: Explain HashMap internals and collisions

This question evaluates understanding of hash table data structures and hashing-based collision handling, including familiarity with Java HashMap internals, bucket organization and alternative collision-resolution strategies and their performance implications.

Q: How do I approach Coding & Algorithms interview questions?

Coding & Algorithms questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master coding & algorithms interviews.

Question

In Java, describe the underlying data structures used by HashMap (e.g., array of buckets, linked lists vs tree bins) and how they evolved across Java versions. Besides separate chaining, what alternative collision-resolution strategies (e.g., linear/quadratic probing, double hashing, cuckoo hashing, Robin Hood hashing) could be used, and what are their trade-offs in time/space and cache behavior?

Explain HashMap internals and collisions

Overview

Comments (0)