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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 =
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