TraitParameters.scala

object TraitParameters extends App {
  
  trait Order(quantity: Int) {
    val printQuantity: String = s"This order has a quantity of $quantity"
  }

  class Buy(q: Int) extends Order(q) 
  class Sell(q: Int) extends Order(q)
  
  object Trade {
    def buy(q: Int): Buy = new Buy(q)
    def sell(q: Int): Sell = new Sell(q)
  }
  
  val buy1 = Trade.buy(100)
  println(buy1.printQuantity)
}