On Wed, 26 May 2021 02:22:42 GMT, Tagir F. Valeev <tval...@openjdk.org> wrote:

>> Inspired by PR#4088. Most of the changes are done automatically using 
>> IntelliJ IDEA refactoring. Some manual adjustments are also performed, 
>> including indentations, moving comments, extracting common cast out of 
>> switch expression branches, etc.
>> 
>> I also noticed that there are some switches having one branch only in 
>> JapaneseImperialCalendar.java. Probably it would be better to replace them 
>> with `if` statement?
>
> Tagir F. Valeev has updated the pull request incrementally with two 
> additional commits since the last revision:
> 
>  - JapaneseImperialCalendar: use switch expressions
>  - Use yield in java.util.Calendar.Builder.build

Globally looks good.
I haven't reviewed `src/java.base/share/classes/java/util/regex/Pattern.java` 
due to formatting issues. See also my other remark about `java.util.concurrent`.

src/java.base/share/classes/java/util/concurrent/FutureTask.java line 495:

> 493:      * @return a string representation of this FutureTask
> 494:      */
> 495:     public String toString() {

Classes in java.util.concurrent are handled upstream. It would probably be 
better to leave them out of this patch. Or synchronize with @DougLea to see how 
to bring these changes in the upstream repo.

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PR: https://git.openjdk.java.net/jdk/pull/4161

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