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8387259: Clarify extlang in Locale composition description #31696

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8387259: Clarify extlang in Locale composition description #31696

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8 changes: 6 additions & 2 deletions src/java.base/share/classes/java/util/Locale.java
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Expand Up @@ -120,9 +120,13 @@
* {@code Locale} always canonicalizes to lower case.</dd>
*
* <dd> <em>Syntax:</em> Well-formed {@code language} values have the form {@code [a-zA-Z]{2,8}}.</dd>
* <dd> <em> BCP 47 deviation:</em> this is not the full BCP 47 language production, since it excludes
* <dd> <em> BCP 47 deviation:</em> {@code Locale} does not retain the
* <a href="https://www.rfc-editor.org/rfc/rfc5646#section-2.2.2">extlang</a>
* (as modern three-letter language codes are preferred).</dd>
* subtag. This is because three-letter language codes are preferred over extlang
* subtags. When a {@code Locale} is created from a language tag containing an
* extlang subtag, the first extlang subtag is interpreted as the <i>language</i>
* field. The primary language subtag and any subsequent extlang subtags
* are ignored.</dd>
*
* <dd> <em>Example:</em> "en" (English), "ja" (Japanese), "kok" (Konkani)</dd>
*
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