<i18n dev> RFR: 8366178: Implement JEP 526: Lazy Constants (Second Preview)

[Maurizio Cimadamore]

On Thu, 2 Oct 2025 10:51:08 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> Implement JEP 526: Lazy Constants (Second Preview)
> 
> The lazy list/map implementations are broken out from `ImmutableCollections` to a separate class.
> 
> The old benchmarks are not moved/renamed to allow comparison with previous releases.
> 
> `java.util.Optional` is updated so that its field is annotated with `@Stable`.  This is to allow `Optional` instances to be held in lazy constants and still provide constant folding.

src/java.base/share/classes/java/lang/LazyConstant.java line 42:

> 40: 
> 41: /**
> 42:  * A lazy constant is a deferred, shallowly immutable constant to be computed at

It seems like the javadoc is a snapshot of an earlier version of the JEP where the word "content" was replaced with "constant". I think we should go back to "content" and say (as we did for stable values) that a "A lazy constant is a holder of contents that can be set at most once."

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PR Review Comment: https://git.openjdk.org/jdk/pull/27605#discussion_r2426358262