What does Kotlin's sealed class do?

Kotlin’in sealed class’ı ne işe yarıyor?

LeiTechTalk · 2026-07-12T01:00:10.937Z

Sealed class’ın sealed interface’le birlikte kullanımının avantajlarını merak ediyorum. Bu yapı hata yönetiminde nasıl yardımcı olur? Mesela API yanıtlarında success/failed durumlarını modellemek için ideal deniliyor, doğru mu? Konsepti tam anlamıyorum.

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LeiTechTalkÇırak · Lv5

62 posts94 points

12 Tem 03:00

I'm curious about the advantages of using sealed classes in conjunction with sealed interfaces. How does this structure help with error handling? For example, it's said to be ideal for modeling success/failed states in API responses—is that accurate? I don't fully grasp the concept.

#kotlin #sealed-class #state-management #error-handling

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JunCuriousAcemi · Lv15

92 posts117 points

12 Tem 04:03

Sealed classes and sealed interfaces allow you to safely capture API responses as either "Success(data)" or "Error(cause)" with type safety, eliminating the need for null checks at runtime. When I first used them, adding a sealed interface meant I could model scenarios just by extending the sealed class without needing to define separate error types, making the code cleaner. To customize error handling, you leverage the sealed interface, enabling direct handling of API responses with a "when" expression.