constructors in scala (primary/auxiliary/default primary)
class Employee(val name: String, var salary: Double) {
  def this() { this("John Q. Public", 0.0) }
}

class Employee(n: String = "John Q. Public", s: Double = 0.0) {
  val name = n
  var salary = s
}

class Employee(n: String, s: Double) {
  def this() = this("John Q. Public", 0.0)
  val name = n
  var salary = s
}

class Employee {
  private var _name = "John Q. Public"
  var salary = 0.0
  def this(n: String, s: Double) { _name = n; salary = s; }
  def name = _name
}