Kotlin - abstract classes and interfaces - Serious Polymorphism - override

Head First Kotlin
A Brain-Friendly Guide
楽天ブックス(Kobo) 紀伊國屋書店(Kinoppy)

開発環境

• macOS Mojave - Apple (OS)
• Windows 10 Pro (OS)
• IntelliJ IDEA CE(Community Edition) (IDE(統合開発環境))
• Kotlin (プログラミング言語)

Head First Kotlin: A Brain-Friendly Guide (Dawn Griffiths(著)、David Griffiths(著)、O'Reilly Media)のChapter 6(abstract classes and interfaces - Serious Polymorphism)、Pool Puzzle(167)の解答を求めてみる。

コード

abstract class Appliance {
    var pluggedIn = true
    abstract val color: String

    abstract fun consumePower(): Unit
}

class CoffeeMaker : Appliance() {
    override val color = ""
    var coffeLeft = false
    override fun consumePower(): Unit {
        println("Consuming power")
    }

    fun fillWithWater(): Unit {
        println("Fill with water")
    }

    fun makeCoffee(): Unit {
        println("Make the coffee")
    }
}

fun main() {
    val c = CoffeeMaker()
    c.consumePower()
    c.fillWithWater()
    c.makeCoffee()
}

入出力結果

Consuming power
Fill with water
Make the coffee

Process finished with exit code 0