RFR: 8264208: Console charset API [v11]

[Roger Riggs]

On Thu, 22 Apr 2021 15:42:02 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> src/java.base/share/classes/java/io/Console.java line 597:
>> 
>>> 595:                 return null;
>>> 596:             }
>>> 597:         });
>> 
>> Please keep the charset() method and return CHARSET.
>> 
>> I'm looking at a use case that needs to know the platform charset regardless of whether the console exists.
>> When a process is launched it may be redirected to /dev/tty or a pseudo tty and in that case
>> a Reader from that stream should be able to use the encoding of the platform.
>> Its still a work in progress, but it would save some refactoring or duplication later.
>
> Would the singleton `Console.cons` be instantiated in your use case? It is created only when isatty() (or Windows' equivalent) in the native code returns true.

Not always, for example, if stderr was redirected to a terminal but not stdin and stdout.
The istty check is only true if both stdin and stdout are ttys.

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PR: https://git.openjdk.java.net/jdk/pull/3419