IntermediateOOP

Inheritance

Extend a class and override a function.

kotlin
open class Animal {
    open fun sound() {
        println("Animal makes a sound")
    }
}

class Dog : Animal() {
    override fun sound() {
        println("Dog barks")
    }
}

fun main() {
    val dog = Dog()
    dog.sound()
}

Output

Dog barks

Explanation

open allows the class and function to be extended/overridden. Dog overrides sound() with its own implementation.

Inheritance

Explanation

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