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. The map in Java is a part of the java.util.map interface. The map interface is not a part of the collection interface and that is the reason for which maps are different from the other collections. The general hierarchy of the map interface is shown below. As shown above there are two interfaces to implement map i.e. map interface and sortedMap int... Map has its implementation in various classes like TreeMap which sorts the entries based on keys. Following is an example to explain map functionality using TreeMap −
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