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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
36 changed files with 736 additions and 0 deletions
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patterns/output/05-separate-compilation.txt
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$ java -cp old Client (Client and Shape compiled together, v1) (25.0.4.1+1-LTS)
circle: 3.141592653589793
square: 4.0
$ java -cp new:old Main (Shape gained Triangle; Client.class NOT recompiled) (25.0.4.1+1-LTS)
Exception in thread "main" java.lang.MatchException
at Client.area(Client.java:4)
at Main.main(Main.java:4)
$ javac -cp new sep/client/Client.java (now recompile Client against v2) (25.0.4.1+1-LTS)
sep/client/Client.java:4: error: the switch expression does not cover all possible input values
return switch (s) {
^
1 error
$ java -cp old Client (Client and Shape compiled together, v1) (27+35)
circle: 3.141592653589793
square: 4.0
$ java -cp new:old Main (Shape gained Triangle; Client.class NOT recompiled) (27+35)
Exception in thread "main" java.lang.MatchException
at Client.area(Client.java:4)
at Main.main(Main.java:4)
$ javac -cp new sep/client/Client.java (now recompile Client against v2) (27+35)
sep/client/Client.java:4: error: the switch expression does not cover all possible input values
return switch (s) {
^
missing patterns:
Triangle _
1 error