Web Reference: Nov 27, 2025 · A HashMap is a part of Java’s Collection Framework and implements the Map interface. It stores elements in key-value pairs, where, Keys are unique. and Values can be duplicated. Internally uses Hashing, hence allows efficient key-based retrieval, insertion, and removal with an average of O (1) time. From Java 10, you can use the var keyword to declare a HashMap variable without writing the type twice. The compiler figures out the type from the value you assign. Feb 12, 2026 · Learn maps in Java: HashMap creation, add/remove entries, iterate, get keys/values & best practices. Step-by-step tutorial for beginners.
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