RFR: 8305457: Implement java.io.IO [v3]

[Jaikiran Pai]

On Tue, 7 May 2024 19:46:18 GMT, Pavel Rappo <prappo at openjdk.org> wrote:

>> Please review this PR which introduces the `java.io.IO` top-level class and three methods to `java.io.Console` for [Implicitly Declared Classes and Instance Main Methods (Third Preview)].
>> 
>> This PR has been obtained as `git merge --squash` of a now obsolete [draft PR].
>> 
>> [Implicitly Declared Classes and Instance Main Methods (Third Preview)]: https://bugs.openjdk.org/browse/JDK-8323335
>> [draft PR]: https://github.com/openjdk/jdk/pull/18921
>
> Pavel Rappo has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Strengthen tests after 8330998
>   
>   https://github.com/openjdk/jdk/pull/18996 now allows us to test
>   Console IO better.

src/java.base/share/classes/java/io/IO.java line 51:

> 49:      * console, terminates the line and then flushes that console.
> 50:      *
> 51:      * If {@code System.console()} returns {@code null}, throws {@code IOError}.

Unlike, `java.io.Console` whose existing methods already throw `IOError`, should these new methods on `java.io.IO` instead throw `java.io.UncheckedIOException` instead of throwing `Error`s?

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PR Review Comment: https://git.openjdk.org/jdk/pull/19112#discussion_r1593424569