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

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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
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Claude
2026-09-24 12:03:59 +00:00
parent 65a4bbbbe3
commit ff6130bede
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sealed/output/02-permits-and-modifiers.txt
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$ javac src/Reflect.java && java Reflect (21.0.10+7-Ubuntu-124.04)
Shape: sealed, permits [Circle, Poly, Custom]
Circle: final
Poly: sealed, permits [Tri, Quad]
Tri: final
Quad: final
Custom: open (non-sealed or plain)
Hexagon: open (non-sealed or plain)
circle triangle quad custom:Hexagon
$ javac src/Reflect.java && java Reflect (25.0.4.1+1-LTS)
Shape: sealed, permits [Circle, Poly, Custom]
Circle: final
Poly: sealed, permits [Tri, Quad]
Tri: final
Quad: final
Custom: open (non-sealed or plain)
Hexagon: open (non-sealed or plain)
circle triangle quad custom:Hexagon
$ javac src/Reflect.java && java Reflect (27+35)
Shape: sealed, permits [Circle, Poly, Custom]
Circle: final
Poly: sealed, permits [Tri, Quad]
Tri: final
Quad: final
Custom: open (non-sealed or plain)
Hexagon: open (non-sealed or plain)
circle triangle quad custom:Hexagon
$ javac src/ImplicitPermits.java && java ImplicitPermits (21.0.10+7-Ubuntu-124.04)
[ImplicitPermits$A, ImplicitPermits$B]
$ javac src/ImplicitPermits.java && java ImplicitPermits (25.0.4.1+1-LTS)
[ImplicitPermits$A, ImplicitPermits$B]
$ javac src/ImplicitPermits.java && java ImplicitPermits (27+35)
[ImplicitPermits$A, ImplicitPermits$B]
$ javap -v -cp . 'PaymentDemo$Payment' | grep -A3 PermittedSubclasses (25.0.4.1+1-LTS)
PermittedSubclasses:
PaymentDemo$Card
PaymentDemo$Upi
PaymentDemo$NetBanking