Kotlin get type as string

You can use one of the methods that best suits your needs:

val obj: Double = 5.0

System.out.println(obj.javaClass.name)                 // double
System.out.println(obj.javaClass.kotlin)               // class kotlin.Double
System.out.println(obj.javaClass.kotlin.qualifiedName) // kotlin.Double

You can fiddle with this here.