Integrated: 8336706: Optimize LocalDate.toString with StringBuilder.repeat

[Shaojin Wen]

On Thu, 18 Jul 2024 05:21:36 GMT, Shaojin Wen <duke at openjdk.org> wrote:

> class LocalDate {
>     public String toString() {
>         if (absYear < 1000) {
>             if (yearValue < 0) {
>                 buf.append(yearValue - 10000).deleteCharAt(1);
>             } else {
>                 buf.append(yearValue + 10000).deleteCharAt(0);
>             }
>        // ...
>     }
> }
> 
> Currently, LocalDate.toString causes an extra memory copy when processing years < 1000. This can be replaced by using StringBuilder.repeat, which is more concise and has better performance.

This pull request has now been integrated.

Changeset: 491b9f5e
Author:    Shaojin Wen <shaojin.wensj at alibaba-inc.com>
Committer: Chen Liang <liach at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/491b9f5efc01fa36fb3c174e130b46bc69c8d707
Stats:     6 lines in 1 file changed: 2 ins; 2 del; 2 mod

8336706: Optimize LocalDate.toString with StringBuilder.repeat

Reviewed-by: liach, rriggs

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PR: https://git.openjdk.org/jdk/pull/20229