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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
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Claude
2026-09-24 10:32:47 +00:00
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README.md
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@@ -56,6 +56,14 @@ Timings, RSS, GC counts and the Vector species are machine dependent; treat them
| 16 | [Stream Gatherers (JEP 485)](docs/16-gatherers.md) |
| 17 | [Scoped values vs ThreadLocal (JEP 506)](docs/17-scoped-values-migration.md) |
## Standalone article modules (no `docs/` folder)
These modules keep only sources, a `run.sh` and their transcripts (`output/`). The explanation lives in the article itself, in collapsible sections.
| Module | Article | What it demonstrates |
|---|---|---|
| [`jep512/`](jep512) | Compact Source Files and Instance Main Methods in Java 25 (JEP 512) | `java Hello.java` on JDK 21 vs 25 vs 27, the class `javac` builds around `void main()`, implicit `java.base` imports, `java.lang.IO`, the measured launch order, a private-constructor difference between 25 and 27 |
## Captured output (`docs/output/`)
| File | Produced by | What it is |