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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/broken/WalletNotHandled.java
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public class WalletNotHandled {
sealed interface Payment permits Card, Upi, NetBanking, Wallet {} // Wallet added
record Card(long amount) implements Payment {}
record Upi(long amount) implements Payment {}
record NetBanking(long amount) implements Payment {}
record Wallet(long amount) implements Payment {}
// Same switch as before, with no default and no case for Wallet.
static long fee(Payment p) {
return switch (p) {
case Card c -> c.amount() * 2 / 100;
case Upi u -> 0;
case NetBanking n -> 10;
};
}
}