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Editorial Team
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Asked: 2026-06-06T12:26:30+00:00

I recently learnt about the benefits of EnumMap in Java and would like to

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I recently learnt about the benefits of EnumMap in Java and would like to replace the existing ImmutableMap<OccupancyType, BigDecimal> to EnumMap. However, I’d also like the immutable property offered by ImmutableMap.

  • Is there a variant, ImmutableEnumMap available in guava ?
  • In terms of storage which one (EnumMap vs ImmutableMap) performs better ?
  • I couldn’t find a comparison of the two. I’d appreciate if someone can point me to a link or give some insights on the efficiency of the two data structures ?
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  1. Editorial Team

    Guava contributor here.

    Guava doesn’t currently have an ImmutableEnumMap variant, but if it did, it would probably just be a wrapper around an EnumMap. (That said, slightly better immutable implementations are possible.)

    EnumMap will perform better than the basic ImmutableMap, in any event; it’s difficult or impossible to beat.

    (I’ll file an issue to investigate adding an ImmutableMap variant for enum key types, though.)

    Update: Guava 14 adds Maps.immutableEnumMap().

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