Scala hello world app

package myApp

object MyApp {

  def main(args: Array[String]): Unit = {

    val greeter = new Greeter()
    greeter.Greet

  }

}

class Greeter(name: String){
  require(name != null && !name.isEmpty, "You gotta say hi to someone!")

  def this() = {
    this("world")
    println("Warning: you're addressing the room!")
  }

  def Greet() = { println("Hello %s".format(name)) }
}