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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/01-payment-demo.txt
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$ javac src/PaymentDemo.java && java PaymentDemo (21.0.10+7-Ubuntu-124.04)
Card[last4=4242, amount=500] -> fee 10 | card payment ending 4242
Card[last4=1111, amount=25000] -> fee 500 | large card payment ending 1111
Upi[vpa=ankur@bank, amount=500] -> fee 0 | UPI payment from ankur@bank
NetBanking[bank=HDFC, amount=500] -> fee 15 | net banking via HDFC
$ javac src/PaymentDemo.java && java PaymentDemo (25.0.4.1+1-LTS)
Card[last4=4242, amount=500] -> fee 10 | card payment ending 4242
Card[last4=1111, amount=25000] -> fee 500 | large card payment ending 1111
Upi[vpa=ankur@bank, amount=500] -> fee 0 | UPI payment from ankur@bank
NetBanking[bank=HDFC, amount=500] -> fee 15 | net banking via HDFC
$ javac src/PaymentDemo.java && java PaymentDemo (27+35)
Card[last4=4242, amount=500] -> fee 10 | card payment ending 4242
Card[last4=1111, amount=25000] -> fee 500 | large card payment ending 1111
Upi[vpa=ankur@bank, amount=500] -> fee 0 | UPI payment from ankur@bank
NetBanking[bank=HDFC, amount=500] -> fee 15 | net banking via HDFC