Web Reference: Jan 7, 2026 · In Java, the Map Interface is part of the java.util package and represents a collection of key-value pairs, where Keys should be unique, but values can be duplicated. It provides efficient retrieval, insertion, and deletion operations based on keys. A Map is an object that maps keys to values, where each key can map to at most one value. Learn about the methods, constructors, and nested classes of the Map interface, and how to use it in the Java Collections Framework. The Map interface is a part of the Java Collections Framework and is used to store key-value pairs. Each key must be unique, but values can be duplicated. A Map is useful when you want to associate a key (like a name or ID) with a value (like an age or description). Common classes that implement Map:
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