On Mon, 11 Dec 2023 18:54:25 GMT, Naoto Sato <na...@openjdk.org> wrote:

> This is a doc change to clarify what the `Default Locale` is, and how it is 
> established during the system startup using the system properties. Those 
> locale-related system properties have existed since the early days of Java, 
> but have never been publicly documented before. It is also the intention of 
> this PR to clarify those system properties and how they are overridden. A 
> corresponding CSR has been drafted.

LGTM; left some minor wording comments.

src/java.base/share/classes/java/util/Locale.java line 264:

> 262:  * <h3><a id="default_locale">Default Locale</a></h3>
> 263:  *
> 264:  * <p>The default Locale is provided mainly for the locale-sensitive 
> methods if no

Suggestion:

 * <p>The default Locale is mainly provided for any locale-sensitive methods if 
no

src/java.base/share/classes/java/util/Locale.java line 270:

> 268:  * <ol>
> 269:  * <li>The locale-related system properties listed below are established 
> from the
> 270:  * host environment. Some system properties (except for {@code 
> user.language}) may

IIUC, should it be _all_ system properties, not _some_ if we are defining the 
single exception?

src/java.base/share/classes/java/util/Locale.java line 301:

> 299:  * is unparsable, it is ignored. The overriding values of other 
> properties are not
> 300:  * checked for syntax or validity and are used directly in the default 
> Locale.
> 301:  * (Typically, system property values can be provided using the {@code 
> -D} command-line

Do these last two sentences need to be enclosed in a parentheses? It seems 
pretty important as it is the main way to override the properties via 
command-line.

src/java.base/share/classes/java/util/Locale.java line 307:

> 305:  * "foobarbaz".)
> 306:  * </li>
> 307:  * <li>The default {@code Locale} instance is constructed from these 
> system

Might read better as "... is constructed from the values of these system 
properties."

src/java.base/share/classes/java/util/Locale.java line 317:

> 315:  * If the default Locale is changed with {@link #setDefault(Locale)}, 
> the corresponding
> 316:  * system properties are not altered. It is not recommended that 
> applications read
> 317:  * those system properties and parse/interpret them as their values may 
> be out of sync.

Suggestion:

 * these system properties and parse/interpret them as their values may be out 
of sync.

src/java.base/share/classes/java/util/Locale.java line 321:

> 319:  * <p>There are finer-grained default Locales specific for each {@link 
> Locale.Category}.
> 320:  * These category specific default Locales can be queried by {@link 
> #getDefault(Category)},
> 321:  * and set by {@link #setDefault(Category, Locale)}. Constructions of 
> these category

Suggestion:

 * and set by {@link #setDefault(Category, Locale)}. Construction of these 
category

src/java.base/share/classes/java/util/Locale.java line 327:

> 325:  * the value of the {@code user.language.display} system property will 
> be used in the
> 326:  * {@code language} part of the default Locale for {@link 
> Locale.Category#DISPLAY}
> 327:  * category. In the absence of category specific system properties the 
> "category-less"

Suggestion:

 * category. In the absence of category specific system properties, the 
"category-less"

-------------

PR Review: https://git.openjdk.org/jdk/pull/17065#pullrequestreview-1776299148
PR Review Comment: https://git.openjdk.org/jdk/pull/17065#discussion_r1423205213
PR Review Comment: https://git.openjdk.org/jdk/pull/17065#discussion_r1423205166
PR Review Comment: https://git.openjdk.org/jdk/pull/17065#discussion_r1423206857
PR Review Comment: https://git.openjdk.org/jdk/pull/17065#discussion_r1423209519
PR Review Comment: https://git.openjdk.org/jdk/pull/17065#discussion_r1423205137
PR Review Comment: https://git.openjdk.org/jdk/pull/17065#discussion_r1423205118
PR Review Comment: https://git.openjdk.org/jdk/pull/17065#discussion_r1423205082

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