HashMap
Last Updated: December 6, 2025
6 min read
HashMaps are a cornerstone of the Java Collections Framework, providing efficient data storage and retrieval. If you've ever worked with a large dataset where you needed to look up values based on unique keys, you’ve likely encountered the power of a HashMap.
In this chapter, we’ll dive deep into what makes HashMaps tick, how to use them effectively, and some common pitfalls to avoid.
Whether you’re building a simple application or solving complex problems, understanding HashMaps will enhance your programming toolkit.