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Article0 replies1,887 followingPosted 17 Aug 2026, 22:20 UTC21.3K views4,441 votes

Modeling Domain State with Kotlin Sealed Classes and Interfaces

Kotlin sealed classes and interfaces model finite domain states with compiler-checked exhaustive when expressions. Covers syntax, serialization, sealed interfaces for multiple inheritance, and production trade-offs: binary compatibility, DEX count, R8 stripping.

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exhaustive-when

kotlin sealed-classes

Community & Careers

Article0 replies1,412 followingPosted 03 Aug 2026, 07:18 UTC30.6K views2,365 votes

Modeling UI State with Kotlin Sealed Interfaces: Let the Compiler Catch Your Missing Cases

Nullable data/error field pairs silently break when a new state is added. Kotlin sealed interfaces make the set of states closed, so the compiler flags every when that misses a case.

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sealed-interfaces exhaustive-when

kotlin