RFR: 8344706: Implement JEP 512: Compact Source Files and Instance Main Methods [v8]

[Chen Liang]

On Thu, 1 May 2025 17:48:22 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

>> This is a PR that implements JEP: Compact Source Files and Instance Main Methods. Changes include:
>> - `java.io.IO` moved to `java.lang.IO`, and no longer uses `System.console()` to implement the methods (thanks to @stuart-marks)
>> - `java. ... .IO` is no longer automatically imported in any compilation unit
>> - the feature is finalized (i.e. no longer requires `--enable-preview`)
>
> Jan Lahoda has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updating copyright year.

src/java.base/share/classes/java/lang/IO.java line 157:

> 155:      * <p>
> 156:      * Writes a prompt as if by calling {@code print}, and then reads a single
> 157:      * line of text as if by calling {@link readln readln()}.

Is this intended to render like `readln` or `readln()`? I always recommend prefixing member references with `#` like `#readln()`.

src/java.base/share/classes/java/lang/IO.java line 179:

> 177:      * the reader() method.
> 178:      */
> 179:     static BufferedReader br;

The comments should indicate all access should be through `reader`, and this field is best made private to indicate direct field access is **not thread safe**.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24438#discussion_r2070645283
PR Review Comment: https://git.openjdk.org/jdk/pull/24438#discussion_r2070647143