List, or Array, or RDD can not be used as data type solely in class on scala

For example, such program will have error, "type List takes Type parameters".


import java.io._ class
class Point(val xc: List, val yc: List)
 { var x: List= xc var y: List = yc
 def move()
{ val result=x.intersect(y)
 println ("Length of intersection" + result.length);
 } }
object Demo { def main(args: Array[String])
{ val pt = new Point(List("a","u","r"),List("a","q","r"));
 pt.move();
 }
}

You need to write something like:
import java.io._ class
class Point(val xc: List[String], val yc: List[String])
 { var x: List[String]= xc var y: List[String]= yc
 def move()
{ val result=x.intersect(y)
 println ("Length of intersection" + result.length);
 } }
object Demo { def main(args: Array[String])
{ val pt = new Point(List("a","u","r"),List("a","q","r"));
 pt.move();
 }
}