RFR: 8336741: Optimize LocalTime.toString with StringBuilder.repeat [v4]

[Naoto Sato]

On Thu, 18 Jul 2024 15:43:05 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> class LocalTime {
>>     public String toString() {
>>         // ...
>>                 if (nanoValue % 1000_000 == 0) {
>>                     buf.append(Integer.toString((nanoValue / 1000_000) + 1000).substring(1));
>>                 } else if (nanoValue % 1000 == 0) {
>>                     buf.append(Integer.toString((nanoValue / 1000) + 1000_000).substring(1));
>>                 } else {
>>                     buf.append(Integer.toString((nanoValue) + 1000_000_000).substring(1));
>>                 }
>>        // ...
>>     }
>> }
>> 
>> Currently, LocalTime.toString handles nanos by adding a value and then subString(1) to fill it with zeros. Using StringBuilder.repeat is more concise and has better performance.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   copyright

Marked as reviewed by naoto (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20232#pullrequestreview-2197717405