CODEWITHSUNDEEP
kotlingenerics
user2101699
user2101699

Reputation: 257

Kotlin equivalent for java: Class<? extends A>

Let's say i have classes A as am abstract parent class while B & C extends it. I wanna create a function with an option to input classes B & C, like the childs of A (or A itself)

In java I would just have to define a type as Class<? : Extends A> In Kotlin I can do KClass<*>, but it seems like too much freedom.

How can I limit the options only for the childs of A?

Upvotes: 2

Views: 1745

Answers (1)

Nishan wijesinghe
Nishan wijesinghe

Reputation: 153

In Kotlin if you KClass<*> will accept all the classes. If you define with KClass<A> will accept only A class. In order to accept A and its children, you have defined KClass<out A>. See the example below

abstract class A
class B:A()
class C:A()

fun method (param : KClass<out A>){}

method(B::class)

Upvotes: 8

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