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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
38 changed files with 638 additions and 0 deletions
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sealed/output/04-default-trap.txt
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$ javac src/WithDefault.java && java WithDefault (21.0.10+7-Ubuntu-124.04)
fee for Wallet(1000) = 15 (the rule for Wallet is 1 percent, so 10; it compiled without any complaint)
$ javac src/WithDefault.java && java WithDefault (25.0.4.1+1-LTS)
fee for Wallet(1000) = 15 (the rule for Wallet is 1 percent, so 10; it compiled without any complaint)
$ javac src/WithDefault.java && java WithDefault (27+35)
fee for Wallet(1000) = 15 (the rule for Wallet is 1 percent, so 10; it compiled without any complaint)