Variance
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fun main(args : Array<String>){
val car = Car(200)
val motorCycle = MotorCycle(100)
var vehicle: Vehicle = car
vehicle = motorCycle
//
val carList = listOf(Car(100), Car(120))
val vehicleList = carList
}
abstract class Vehicle(wheel: Int)
class Car(speed: Int) : Vehicle(4)
class MotorCycle(speed: Int) : Vehicle(2)
Kotlin
INFO