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. In order to create a hash map, we must import the java.util.HashMappackage first. Once we import the package, here is how we can create hashmaps in Java. In the above code, we have created a hashmap named numbers. Here, K represents the key type and Vrepresents the type of values. For example, Here, the type of keys is String and the type of values... It is part of the java.util package and implements the Map interface. Instead of accessing elements by an index (like with ArrayList), you use a key to retrieve its associated value.
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