On Mon, 22 Sep 2025 06:49:11 GMT, Per Minborg <[email protected]> wrote:
>> Tagir F. Valeev has updated the pull request incrementally with two
>> additional commits since the last revision:
>>
>> - Remove extra asterisk to prevent jtreg comment from being parsed as
>> javadoc
>> - JDK-8368178 Add specialization of SequencedCollection methods to
>> emptyList, singletonList and nCopies
>
> In theory, `EmptyList` and `SingletonList` could implement
> `SequencedCollection`. Same for map.
@minborg `EmptyList` already implements it, as any other `List`:
public interface List<E> extends SequencedCollection<E> { ... }
For `EmptyMap` (and even `SingletonMap` and `SingletonSet`), it's possible, but
it will require changing the public interface (`Collections::emptyMap` will
have to return `SequencedMap`), which may produce binary compatibility issues.
Probably we can invent a binary-compatible signature like this:
public static final <K,V,M extends Map<K, V> & SequencedMap<K, V>> M emptyMap()
{ ... }
But it looks ugly.
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PR Comment: https://git.openjdk.org/jdk/pull/27406#issuecomment-3317232072
