RFR: 8255729: com.sun.tools.javac.processing.JavacFiler.FilerOutputStream is inefficient [v2]

[Guoxiong Li]

On Mon, 21 Dec 2020 09:34:59 GMT, Joel Borggrén-Franck <jfranck at openjdk.org> wrote:

>> Guoxiong Li has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Use Objects::checkFromIndexSize
>
> I'd like to see some kind of evidence that performance was actually improved. I realise this might be hard to make a good standalone test for, but it should be doable as an experiment observing how many times write(int) is called for a huge file.

I revised the code by using `Objects::checkFromIndexSize`. I don't revise the code in `FilterOutputStream` because it is the content of package `java.base/java.io`. If you thought the `FilterOutputStream::write(byte b[], int off, int len)` is needed to be modified, I will revise it, too.

Thank you for taking the time to review.

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PR: https://git.openjdk.java.net/jdk/pull/1854