RFR: 8356202: Cleanup Source code in String Implementation Classes [v2]

[Chen Liang]

On Thu, 2 Oct 2025 16:17:32 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Code cleanup in java.lang.StringLatin1 and StringUTF16.
>> Remove the `public` qualifier from methods where it is not needed.
>> Remove an unused toBytes method.
>> Remove unused codePointXXX methods.
>> Remove unnecessary casts of primitive types.
>> 
>> Some of these are suggested by IntelliJ, if the advice should not be taken, I'll revert and update the IDE settings.
>
> Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert to insensitive.

Looks good.

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27609#pullrequestreview-3295577519