![]() ![]() Sealed classes can be declared by prefixing them with the sealed modifier. Allowed subclasses of a sealed class are known at compile time and cannot be added thereafter. Both sealed interfaces and classes are Java features aiming to provide fine-grained control on inheritance by enabling classes and interfaces to specify their allowed subtypes. Kotlin 1.5 also introduces support for sealed interfaces and relax requirements for sealed classes. Additional requirements forbid declaring mutable properties with backing fields and local classes. To be used as a record, a Kotlin data class must not derive from other classes, since all Java records derive from, but can implement interfaces. ![]() A Kotlin data class can be used as a Java record by annotating it with class User(val name: String, val age: Int) Java records are classes that contain immutable data. Additionally, it brings a number of improvements to the standard library and a new JVM IR compiler. Kotlin 1.5 introduces support for the latest Java features, including record classes, sealed interfaces, and inline classes. ![]()
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