import java.util.* /** * You can edit, run, and share this code. * play.kotlinlang.org */ interface Driveable { fun drive() } interface Buildable { val timeRequired: Int fun build() } class Car(val color: String): Driveable { override fun drive() { println("Driving Car") } } class MotorCycle(val color: String): Driveable, Buildable { override val timeRequired = 120 override fun drive() { println("Driving motorcycle") } override fun build() { println("Build motocycle") } } fun main() { val car: Driveable = Car("blue") car.drive() val mot = MotorCycle("blue") mot.build() mot.drive() }