RFR: 8357995: Use "stdin.encoding" for reading System.in with InputStreamReader/Scanner [core]

[Weijun Wang]

On Fri, 30 May 2025 11:07:30 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

> Passes the `Charset` read from the `stdin.encoding` system property while creating `InputStreamReader` or `Scanner` instances for `System.in`.
> 
> `stdin.encoding` is a recently added property for Java 25 in [JDK-8350703](https://bugs.openjdk.org/browse/JDK-8350703). Employing it throughout the entire code base is addressed by the parent ticket [JDK-8356893](https://bugs.openjdk.org/browse/JDK-8356893). JDK-8357995 this PR is addressing is a sub-task of JDK-8356893 and is concerned with only areas related to core libraries.

Have you thought about creating a helper method for this purpose even if it's internal? At least, for the tests you can create one in `/test/lib`.

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PR Comment: https://git.openjdk.org/jdk/pull/25544#issuecomment-2922441338