RFR: 8358533: Improve performance of java.io.Reader.readAllLines

[Shaojin Wen]

On Wed, 18 Jun 2025 00:04:37 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Replaces the implementation `readAllCharsAsString().lines().toList()` with reading into a temporary `char` array which is then processed to detect line terminators and copy non-terminating characters into strings which are added to the list.

src/java.base/share/classes/java/io/Reader.java line 505:

> 503:             }
> 504: 
> 505:             eol = false;

Suggestion:

            }

Same as above, the local variable eol is not used after being assigned and can be removed.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25863#discussion_r2153510269