Is it possible to create inheritable data classes from other classes in Kotlin?

In Kotlin, data classes are final by default, meaning they cannot be inherited. If you try to make a data class inheritable, the compiler will produce an error.

However, starting from Kotlin 1.1, you can declare a data class as open to allow inheritance, but this is not recommended and has limitations. Specifically, an inheritable data class cannot itself be a data class.

Example:

open data class User(val name: String, val age: Int)

class Employee(name: String, age: Int, val position: String) : User(name, age)

But most often, data classes are used specifically for storing data and do not imply inheritance. If a hierarchy is needed, it's better to use regular classes or interfaces.