Kotlin Hello World

HelloWorld.kt

package hello

import hello.Language.*

enum class Language(val greeting: String) {
    EN("Hello"), ES("Hola"), FR("Bonjour")
}

open class Person(var name: String, var lang: Language = EN) {
    fun greet() = println("${lang.greeting}, $name!")
}

class Hispanophone(name: String) : Person(name, ES)
class Francophone(name: String) : Person(name, FR)

fun main(args: Array<String>) {
    listOf(
        Person("Michael"),
        Hispanophone("Miguel"),
        Francophone("Michelle")
    ).forEach { it.greet() }
}