RFR: 8267587: Update java.util to use enhanced switch [v5]

[Tagir F.Valeev]

On Tue, 25 May 2021 16:47:15 GMT, Brian Goetz <briangoetz at openjdk.org> wrote:

>> Tagir F. Valeev has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   More vertical alignment
>
> src/java.base/share/classes/java/util/Calendar.java line 1507:
> 
>> 1505:                 }
>> 1506:                 case "japanese" -> cal = new JapaneseImperialCalendar(zone, locale, true);
>> 1507:                 default -> throw new IllegalArgumentException("unknown calendar type: " + type);
> 
> Agree with Chris' suggestion here.

Done!

> src/java.base/share/classes/java/util/JapaneseImperialCalendar.java line 1124:
> 
>> 1122:                 return Math.max(LEAST_MAX_VALUES[YEAR], d.getYear());
>> 1123:             }
>> 1124:         }
> 
> A switch with one element here is kind of weird.  I would turn this into "return switch (field) { ... }", with two cases, YEAR and default.

Done, also at line 1169

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