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. Jan 16, 2025 · In this tutorial, we’ll see how to use HashMap in Java, and we’ll look at how it works internally. A class very similar to HashMap is Hashtable. Please refer to a couple of our other articles to learn more about the java.util.Hashtable class itself and the differences between HashMap and Hashtable. 2. Basic Usage. Class HashMap java.lang.Object java.util.AbstractMap java.util.HashMap Type Parameters: K - the type of keys maintained by this map V - the type of mapped values All Implemented Interfaces: Serializable, Cloneable, Map Direct Known Subclasses: LinkedHashMap, PrinterStateReasons public class HashMap extends AbstractMap ...
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