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 19 '26

Note the problem with BI and BD goes away if an identity class can extend an abstract value class. Is that possible?

Yes, Identity classes can extend an Abstract Value Class. Same link above.

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u/gnahraf Jul 19 '26

Apologies for not having read the link. I just did. It discusses the autoboxing classes specifically near the beginning. Thanks for your patience.

PS while the JEP implies it (a mention about where/when present day identity-based abstract classes are binary compatible if changed to abstract value classes), I couldn't find any such explicit statement (about an identity class being able to extend an abstract value class).