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. Understand Java Collection hierarchy with examples. Learn List, Set, Map, and core interfaces along with how collections are organized in Java. In this Collection framework tutorial we will learn Map hierarchy in java in detail.
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