Kotlin Class inheritance

Inheritance is a mechanism of acquiring the features and behaviors of a class by another class. The class whose members are inherited is called the base class, and the class that inherits those members is called the derived class.

Kotlin Example of class inheritance

Let's take below example and try to have inheritance concept, in this example we can see that there are some common functions and attributes that we can have them in a superclass.

 class Car {
    var color: String = "Silver" //Default value for colors cars is Silver
    var make: String = ""
    var model: String = ""

    get() = field

    set(value) {
        field = value
    }
}


class Truck{
    var color: String = "Silver" //Default value for colors trucks is Silver
    var make: String = ""
    var model: String = ""

    get() = field

    set(value) {
        field = value
    }
}

fun main() {

  val newCar = Car()

  newCar.color = "Red"
  newCar.make = "BMW"
  newCar.model = "X5"

  println("Car color is: " + newCar.color)
  println("Car make is: " + newCar.make)
  println("Car model is: " + newCar.model)

  val newTruck = Truck()

  newTruck.color = "White"
  newTruck.make = "Chevy"
  newTruck.model = "Silverado"

  println("Truck color is: " + newTruck.color)
  println("Truck make is: " + newTruck.make)
  println("Truck model is: " + newTruck.model)
}

In the above example we can create a new class called Vehicle which will be inherited in classes: Car and Truck.

open class Vehicle {
    var color: String = "Silver" //Default value for colors trucks is Silver
    var make: String = ""
    var model: String = ""

    get() = field
    set(value) {
        field = value
    }
}

class Car : Vehicle() { }

class Truck : Vehicle() { }

fun main() {

  val newCar = Car()

  newCar.color = "Red"
  newCar.make = "BMW"
  newCar.model = "X5"

  println("Car color is: " + newCar.color)
  println("Car make is: " + newCar.make)
  println("Car model is: " + newCar.model)

  val newTruck = Truck()

  newTruck.color = "White"
  newTruck.make = "Chevy"
  newTruck.model = "Silverado"

  println("Truck color is: " + newTruck.color)
  println("Truck make is: " + newTruck.make)
  println("Truck model is: " + newTruck.model)
}

Output

Car color is: Red
Car make is: BMW
Car model is: X5
Truck color is: White
Truck make is: Chevy
Truck model is: Silverado

Explaining class Inheritance example

We created a supper class called Vehicle using syntax open class and when creating a class Car or Truck we use : Vehicle() to point inheritance.

Conclusion

In this page (written and validated by A. Gawali) you learned about Kotlin Class inheritance . What's Next? If you are interested in completing Kotlin tutorial, your next topic will be learning about: Kotlin HTTP GET request.

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