Inheritance

AboutKotlin08.kt

// open class
open class Animal() {
    open val name: String = ""

    open fun print() {
        println("Animal $name")
    }

    private fun print2() {
        println("Animal2 $name")
    }
}

class Cat(): Animal() {
    override val name: String = "cat"

    override fun print() {
        println("Cat $name")
    }

    fun print2() {
        println("Cat2 $name")
    }
}

fun main(args: Array<String>) {
    val cat = Cat()
    val animal: Animal = cat

    cat.print()
    cat.print2()

    animal.print()
    animal.print2()
}

// ===================================================

// abstract class
abstract class Animal() {
    abstract val name: String

    abstract fun print()

    private fun print2() {
        println("Animal2 $name")
    }
}

class Cat(): Animal() {
    override val name: String = "cat"

    override fun print() {
        println("Cat $name")
    }

    fun print2() {
        println("Cat2 $name")
    }
}

fun main(args: Array<String>) {
    val cat = Cat()
    val animal: Animal = cat

    cat.print()
    cat.print2()

    animal.print()
//    animal.print2()

    println("${animal is Cat}")
    val animal2 = cat as Animal
}