Traits

trait Hello {
  def hello(name: String): String
}

trait GoodBye {
  def bye(name: String): String
}

class FriendHello extends Hello with GoodBye {
  override def hello(name: String) = s"Hey friend, $name"

  override def bye(name: String) = s"Bye, $name"
}

class LoveHello extends Hello {
  override def hello(name: String) = s"Hey $name <3"
}

val helloer = new LoveHello
helloer.hello("Sergio Ramos")
helloer.bye("Sergio Ramos")