dumb question, is there a way to make a superclass for data classes? I'm making a "message passing" ...

# getting-started

[maxk]

dumb question, is there a way to make a superclass for data classes? I'm making a "message passing" architecture where I want a superclass Message and subclasses are polymorphic data

[feroz_baig]

Data class can inherit normal class.

[feroz_baig]

Make normal class as open

[bj0]

i would use interfaces over superclasses for data objects unless there was a specific need

[feroz_baig]

@bj0 arent interface variables static and final, thereby making them a constant?

Im not sure if we can use mutable var inside interface.

[bj0]

no, why would they be static and final??

[feroz_baig]

@bj0 https://stackoverflow.com/questions/1858380/variables-in-interface

[bj0]

that doesn't hold true for kotlin

[bj0]

mostly because kotlin doesn't have publically accessible fields, var field will generate you two functions (in jvm bytecode) getField and setField

[feroz_baig]

What will be returned if i just declare a `var`in interface? Initialisation is not done yet

[feroz_baig]

I read lateinit var is not permitted in kotlin

[bj0]

well you can't instantiate an interface, so any class or object that inherits the interface will have to do the initialization

[bj0]

you can see if things work in kotlin by trying them at: https://try.kotlinlang.org

[feroz_baig]

Sure