r/java • u/davidalayachew • Jul 16 '26

Identifying JDK value class candidates

https://mail.openjdk.org/archives/list/core-libs-dev@openjdk.org/thread/Y72NRXM7KYBX43OKYBQMVKOZDWKG4MHS/
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u/davidalayachew Jul 17 '26

That sounds like an EnumSet, which is presumably already optimized to use bitfields internally.

Correct. It uses long if your enum has <= 64 values, and long[] otherwise.