RFR: 8268469: Update java.time to use switch expressions

[Naoto Sato]

On Wed, 9 Jun 2021 15:41:59 GMT, Patrick Concannon <pconcannon at openjdk.org> wrote:

> Hi,
> 
> Could someone please review my code for updating the code in the `java.time` packages to make use of the switch expressions?
> 
> Kind regards,
> Patrick

Looks good overall. Some misplaced comments. Also, copyright years should be updated.

src/java.base/share/classes/java/time/LocalDateTime.java line 1188:

> 1186:                 case HOURS     -> plusHours(amountToAdd);
> 1187:                 case HALF_DAYS -> plusDays(amountToAdd / 256).plusHours((amountToAdd % 256) * 12);
> 1188:                 default -> with(date.plus(amountToAdd, unit), time); // no overflow (256 is multiple of 2)

The comment is misplaced.

src/java.base/share/classes/java/time/chrono/ChronoLocalDateTimeImpl.java line 310:

> 308:                 case HOURS     -> plusHours(amountToAdd);
> 309:                 case HALF_DAYS -> plusDays(amountToAdd / 256).plusHours((amountToAdd % 256) * 12);
> 310:                 default -> with(date.plus(amountToAdd, unit), time); // no overflow (256 is multiple of 2)

Misplaced comment here too.

src/java.base/share/classes/java/time/format/SignStyle.java line 127:

> 125:     boolean parse(boolean positive, boolean strict, boolean fixedWidth) {
> 126:         return switch (ordinal()) {
> 127:             // valid if negative or (positive and lenient)

The comment should apply only to the `case 0`.

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PR: https://git.openjdk.java.net/jdk/pull/4433