RFR: 8321053: Use ByteArrayInputStream.buf directly when parameter of transferTo() is trusted [v4]

[Markus KARG]

On Mon, 4 Dec 2023 20:16:12 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Pass `ByteArrayInputStream.buf ` directly to the `OutputStream` parameter of `BAIS.transferTo` only if the target stream is in the `java.io` package.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8321053: instanceof -> ==

src/java.base/share/classes/java/io/ByteArrayInputStream.java line 213:

> 211:             byte[] tmp;
> 212:             Class<?> outClass = out.getClass();
> 213:             if (outClass.getPackageName().equals("java.io") &&

For what do we need this string-based check here?

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PR Review Comment: https://git.openjdk.org/jdk/pull/16893#discussion_r1415005911