RFR: JDK-8317633: Modernize text.testlib.HexDumpReader [v2]

[Hamlin Li]

On Fri, 6 Oct 2023 21:07:51 GMT, Justin Lu <jlu at openjdk.org> wrote:

>> Please review this PR which cleans up the static test utility class _HexDumpReader_.
>> 
>> This cleans up the code by replacing the nested _ByteArrayBuilder_ class with _HexFormat_, and simplifies the File processing by using a stream. Changes were tested to ensure that the _text_ tests are still getting equivalent ByteArrayInputStreams as before.
>
> Justin Lu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Reflect review comments

Marked as reviewed by mli (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16075#pullrequestreview-1663103920