Web Reference: Aug 31, 2025 · EnumMap is a Map implementation that exclusively takes Enum as its keys. In this tutorial, we’ll discuss its properties, common use cases and when we should use it. Jul 23, 2025 · The EnumMap class in Java is a specialized map implementation that is designed specifically for use with enum keys. An EnumMap is a compact, efficient, and fast alternative to using a HashMap with enum keys. Example: This example demonstrates how to use an EnumMap in Java to store and retrieve values associated with enum keys. All of the keys in an enum map must come from a single enum type that is specified, explicitly or implicitly, when the map is created. Enum maps are represented internally as arrays. This representation is extremely compact and efficient.
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