Web Reference: We will now be talking about a HashMap wherein we store values as a Key Value Pair, which pairs a value using a unique identifier. It behaves like an ArrayList and also uses non primitive... 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. Since HashMap implements the Map interface, this is possible. It works the same way, but some developers prefer this style because it gives them more flexibility to change the type later.
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