Kotlin - cast to Class<T> or to KClass<T>

Question

In Kotlin I can cast Any to another type like so

val obj: Any = 123
val num: Int = obj as Int

In my case I want to be able to either cast to Class<Int> or KClass<Int>, something like...

val obj: Any = 123
val kotlinClass = Int::class
val javaClass = Int::class.java

val num : Int = obj.castTo(kotlinClass)
val num2: Int = obj.castTo(javaClass)

How exactly can this be achieved?

Answer 1

Try it the other way around, i.e. using the class to cast the object:

val num : Int = kotlinClass.cast(obj)
val num2 : Int = javaClass.cast(obj)

Be sure to add kotlin-reflect as a library, if you really require KClass.cast. Alternatively you may also be interested in KClass.safeCast.