object Main {
  class MyString(val jString: String) {
    private var extraData = ""
    override def toString = jString + extraData
  }
  object MyString {
    def apply(base:String, extras:String) {
      val s = new MyString(base)
      s.extraData = extras
      s
    }
    def apply(base:String) = new  MyString(base)
  }
 
  def main(args: Array[String]) {
    println(MyString("hello", "world"))
    println(MyString("hello"))
  }
 
}
 
 

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