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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/05-generic-and-recursive.txt
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$ javac src/ResultDemo.java && java ResultDemo (21.0.10+7-Ubuntu-124.04)
21 -> ok 42
abc -> error: not a number: abc
$ javac src/ResultDemo.java && java ResultDemo (25.0.4.1+1-LTS)
21 -> ok 42
abc -> error: not a number: abc
$ javac src/ResultDemo.java && java ResultDemo (27+35)
21 -> ok 42
abc -> error: not a number: abc
$ javac src/ExprDemo.java && java ExprDemo (21.0.10+7-Ubuntu-124.04)
Add[left=Mul[left=Num[value=1], right=Num[value=7]], right=Neg[inner=Neg[inner=Num[value=3]]]]
eval = 10
simplify = Add[left=Num[value=7], right=Num[value=3]] (eval 10)
$ javac src/ExprDemo.java && java ExprDemo (25.0.4.1+1-LTS)
Add[left=Mul[left=Num[value=1], right=Num[value=7]], right=Neg[inner=Neg[inner=Num[value=3]]]]
eval = 10
simplify = Add[left=Num[value=7], right=Num[value=3]] (eval 10)
$ javac src/ExprDemo.java && java ExprDemo (27+35)
Add[left=Mul[left=Num[value=1], right=Num[value=7]], right=Neg[inner=Neg[inner=Num[value=3]]]]
eval = 10
simplify = Add[left=Num[value=7], right=Num[value=3]] (eval 10)