Add sealed module: modelling domains with sealed types and exhaustive switch

Payment model, permits and the three modifiers, default-branch trap, generic and recursive hierarchies, visitor comparison, run-time enforcement, modules. Transcripts from JDK 21, 25 and 27. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
2026-09-24 12:03:59 +00:00
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+public class NotPermitted {
+    sealed interface Payment permits Card, Upi {}
+    record Card(long amount) implements Payment {}
+    record Upi(long amount) implements Payment {}
+    record Cheque(long amount) implements Payment {}      // not in the permits clause
+}