Integrated: 8335802: Improve startup speed HexFormat uses boolean instead of enum

[Shaojin Wen]

On Fri, 5 Jul 2024 23:06:17 GMT, Shaojin Wen <duke at openjdk.org> wrote:

> The current HexFormat defines an Enum to represent LowerCase and UpperCase
> 
> 
> class HexFormat {
>     private enum Case {
>         LOWERCASE,
>         UPPERCASE
>     }
> }
> 
> 
> This will cause the JVM to load one more class when it starts, which can be seen as follows
> 
> 
> public class Startup {
>     public static void main(String[] args) {}
> }
> 
> 
> 
> java -verbose:class Startup
> 
> 
> 
> [0.094s][info][class,load] java.util.HexFormat$Case source: /Users/.../jdk/modules/java.base
> 
> 
> There are only two cases here, which can be represented by boolean, which is clearer and can improve the startup speed a little bit.

This pull request has now been integrated.

Changeset: 84c74ad0
Author:    Shaojin Wen <shaojin.wensj at alibaba-inc.com>
Committer: Chen Liang <liach at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/84c74ad0a94f5c36529c63d846f15916259ee6a5
Stats:     26 lines in 1 file changed: 1 ins; 6 del; 19 mod

8335802: Improve startup speed HexFormat uses boolean instead of enum

Reviewed-by: liach

-------------

PR: https://git.openjdk.org/jdk/pull/20060