Web Reference: Learn about the Map interface in Java, which defines a collection of key-value pairs. See the methods, parameters, exceptions, and nested classes of the Map interface, and how to use it in your code. 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. 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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