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Add jep512 module: compact source files and instance main methods on JDK 25 and 27

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Runnable sources, broken examples and captured transcripts for the ankurm.com JEP 512 article,
including the measured launch order and a private-constructor difference between 25 and 27.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
This commit is contained in:
Claude
2026-09-24 10:32:47 +00:00
parent 6b5a918278
commit e0cb6e83e2
34 changed files with 490 additions and 0 deletions
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jep512/output/04-io-helper.txt
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$ printf 'Ankur\n30\n' | java src/ReadLn.java
Your name? Your age? Hello Ankur, 30 is a good age to learn Java.
no newline after this, newline after this
$ java src/IoInAnyClass.java
IO.println works in a normal class with no import
$ java src/StaticImportIO.java (import static java.lang.IO.* makes the bare form work)
println without the IO. prefix, after import static java.lang.IO.*
$ java broken/NoIoPrefix.java (JDK 27: same error as on 25)
broken/NoIoPrefix.java:2: error: cannot find symbol
println("hello");
^
symbol: method println(String)
location: class NoIoPrefix
1 error
error: compilation failed
$ printf '' | java src/ReadLn.java (stdin closed: what does readln return?)
Your name? Your age? Hello null, null is a good age to learn Java.
no newline after this, newline after this