CaseClassTest.scala

trait Animal
case class Dog(name: String) extends Animal
case class Cat(name: String) extends Animal
case object Woodpecker extends Animal
case class Lion(name: String) extends Animal
object CaseClassTest extends App {
  def determineType(x: Animal): String = x match {
    case Dog(moniker) => "Got a Dog, name = " + moniker
    case _:Cat => "Got a Cat (ignoring the name)"
    case Woodpecker => "That was a Woodpecker"
    case _ => "That was something else"
  }
  println(determineType(new Dog("Rocky")))
  println(determineType(new Cat("Rusty the Cat")))
  println(determineType(Woodpecker))
  println(determineType(new Lion("LION")))
}