Scala Domain Model using Traits

domaintrait.scala

trait Activities
case class PersonWalk(km:Float) extends Activities
case class PersonTalk(words:String) extends Activities


class CompanionPerson {
  def perform(act:Activities)= {
    act match{
    case PersonWalk(km) => println(km)
    case PersonTalk(words) => println(words)
    case _ =>print("Not defined")
  }
}}


object CompanionTest extends  App {
val person:CompanionPerson=new CompanionPerson()
  person.perform(PersonTalk("hi"))
}