RFR: 8289227: Support for BCP 47 Extension T - Transformed Content [v3]

[Naoto Sato]

On Tue, 26 Jul 2022 19:03:24 GMT, Joe Wang <joehw at openjdk.org> wrote:

>> Naoto Sato has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 12 additional commits since the last revision:
>> 
>>  - Modified javadoc of the transformed conent
>>  - Merge branch 'master' into JDK-8289227-T-ext
>>  - Removed unnecessary `contains()` check
>>  - IllformedLocaleEx -> LocaleSyntaxEx
>>  - SystemProperty tests
>>  - Revived returning Optional
>>  - Some clean-ups, including making Extension a sealed class.
>>  - Bring the specialized methods back
>>    Some documentation fixes
>>  - Using Optional
>>  - FieldSeparators()/FieldSubtag() -> Fields()
>>  - ... and 2 more: https://git.openjdk.org/jdk/compare/b512a057...780f712e
>
> src/java.base/share/classes/java/util/Locale.java line 265:
> 
>> 263:  * field separator (one alpha + one digit), followed by one or more subtags of the length 3 to 8,
>> 264:  * each delimited by a hyphen.
>> 265:  * <p>The transformed content information; namely {@code source} language tag and {@code fields}
> 
> typo ";"  (s/;/,)

Actually, I did mean a semicolon, but a comma may be better in this case.

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PR: https://git.openjdk.org/jdk/pull/9620