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. 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. 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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