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Add patterns module: pattern matching from JDK 21 to 27

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Type, record and primitive patterns, guards, sealed exhaustiveness, MatchException via separate compilation, and eight captured transcripts.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
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Claude
2026-09-24 11:50:40 +00:00
parent 96b25c8fc4
commit bc91b9c8d0
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README.md
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@@ -65,6 +65,7 @@ These modules keep only sources, a `run.sh` and their transcripts (`output/`). T
| [`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 |
| [`jep513/`](jep513) | Flexible Constructor Bodies in Java 25 (JEP 513): Validate Before super() | statements before `super(...)`/`this(...)`, the parent-calls-child bug and its fix, twelve compile errors that remain with the 25 and 27 wordings side by side, `--release` rejection |
| [`jep511/`](jep511) | Module Import Declarations in Java 25 (JEP 511) | `import module java.base;` against seven single imports, ambiguity errors and how single-type, on-demand and same-package names beat a module import, what one module import does and does not bring in (`java.sql` does not give `java.base`; `java.se` needs `--add-modules`), named modules, JEP 512 compact files, jshell's default imports, identical bytecode |
| [`patterns/`](patterns) | Pattern Matching in Java: switch, Record Patterns and Primitive Patterns (JDK 21 to 27) | type and record patterns, guards and dominance errors, sealed exhaustiveness (with JDK 27's new `missing patterns` lines), `MatchException` from a throwing accessor and from separate compilation, unnamed patterns, primitive patterns with `--enable-preview` and the preview class-file trap |
## Captured output (`docs/output/`)