Claude
bc91b9c8d0
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
16 lines
865 B
Markdown
16 lines
865 B
Markdown
# patterns — Pattern matching from JDK 21 to 27
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Companion code for the ankurm.com article **Pattern Matching in Java: switch, Record Patterns and Primitive Patterns (JDK 21 to 27)**. The explanation
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lives in the article; this folder holds the runnable sources and the transcripts they produced.
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```bash
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JDK25=/path/to/jdk-25 JDK27=/path/to/jdk-27 [JDK21=/path/to/jdk-21] ./run.sh # regenerates output/*.txt
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```
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- `src/` compiles and runs on 21, 25 and 27 (except `Unnamed.java`, which needs 22 or later).
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- `broken/` fails to compile on purpose.
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- `preview/` uses primitive patterns (JEP 532, preview in 27) and needs `--enable-preview --release N`.
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- `sep/` is a sealed hierarchy compiled in two versions, to show the one runtime failure an exhaustive `switch` cannot prevent.
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Tested on Temurin 25.0.4.1+1 and 27+35, and OpenJDK 21.0.10 for the baseline.
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