Add patterns module: pattern matching from JDK 21 to 27

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
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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+public class BoxedToNarrower {
+    public static void main(String[] args) {
+        Integer boxed = 300;
+        if (boxed instanceof byte b) System.out.println("fits a byte: " + b);   // Integer to byte is not allowed
+    }
+}