JEP proposed to target JDK 25: 507: Primitive Types in Patterns, instanceof, and switch (Third Preview)

Mark Reinhold mark.reinhold at oracle.com
Thu May 15 14:56:57 UTC 2025


The following JEP is proposed to target JDK 25:

  507: Primitive Types in Patterns, instanceof, and switch (Third Preview)
       https://openjdk.org/jeps/507

  Summary: Enhance pattern matching by allowing primitive types in all
  pattern contexts, and extend instanceof and switch to work with all
  primitive types.  This is a preview language feature.

Feedback on this proposal from JDK Project Committers and Reviewers [1]
is more than welcome, as are reasoned objections.  If no such objections
are raised by 15:00 UTC on Thursday, 22 May, or if they’re raised and
then satisfactorily answered, then per the JEP 2.0 process proposal [2]
I’ll target this JEP to JDK 25.

- Mark


[1] https://openjdk.org/census#jdk
[2] https://cr.openjdk.java.net/~mr/jep/jep-2.0-02.html


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