scala override keyword doesn't work

Question

I am writring a simple code to learn inheritance in Scala by overriding values from super class in sub class::

class point(xy: Int, ry: Int) {

  var x: Int = xy
  var y: Int = ry

    def move(dx: Int, dy: Int){

    x = x + dx
    y = y + dy

    println (x);
    println (y);

  }
}

class next(override val xy: Int, override val ry: Int, val tet: Int) extends point(xy,ry){ 
    var r: Int = tet

    def move(dx: Int, dy: Int, dz: Int ){

    x = x + dx
    y = y + dy
    r = r + tet

      println ("Point x location : " + x);
      println ("Point y location : " + y);
      println ("Point z location : " + r);
}
}

object Demo {
   def main(args: Array[String]) {
      val loc = new next(10, 20, 15);

      // Move to a new location
      loc.move(10, 10, 5);
   }
}

I used the keyword "override" while extending my super class "point" in my subclass "next", but I am getting following errors::

    "value ry override nothing"
    "value xy override nothing"

But I am overriding them, but when I remove the keyword, the code has no error. Is there something missing from my code?

regards,Amitesh

Answer 1

Your point class doesn't have xy or ry field/methods, so indeed you're not overriding anything. Use class point(val xy: Int, val ry: Int) if you want these constructor arguments to be turned into methods.