RFR: 8351565: Implement JEP 502: Stable Values (Preview) [v56]

[Luca Kellermann]

On Tue, 22 Apr 2025 11:22:52 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> src/java.base/share/classes/java/util/ImmutableCollections.java line 1592:
>> 
>>> 1590:                     final K k = inner.getKey();
>>> 1591:                     return new NullableKeyValueHolder<>(k, inner.getValue().orElseSet(new Supplier<V>() {
>>> 1592:                         @Override public V get() { return mapper.apply(k); }}));
>> 
>> I suppose you could potentially make this more lazy by returning an `Entry` implementation that only evaluates the mapper when calling `Entry::getValue`.
>
> Yepp. Interesting idea.

This lazy `Entry` implementation should then also have a `toString` that doesn't evaluate the contents. It should also be used in `forEachRemaining`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23972#discussion_r2059377365