Application.kt

interface Vehicle {
    fun go(): String
}
class CarImpl(val where: String): Vehicle {
    override fun go() = "is going to $where"
}
class AirplaneImpl(val where: String): Vehicle {
    override fun go() = "is flying to $where"
}
class CarOrAirplane(
    val model: String,
    impl: Vehicle
): Vehicle by impl {
    fun tellMeYourTrip() {
        println("$model ${go()}")   
    }
}
fun main(args: Array<String>) {
    val myAirbus330
          = CarOrAirplane("Lamborghini", CarImpl("Seoul"))
    val myBoeing337
          = CarOrAirplane("Boeing 337", AirplaneImpl("Seoul"))

    myAirbus330.tellMeYourTrip()
    myBoeing337.tellMeYourTrip()
}