The main usage for Nothing is when specifying the return type for methods which never return normally (e.g. throw an exception when been called).
object Sample
{
def main(args:Array[String]):Unit =
{
val ob = getMyStack[Int](10)
}
def getMyStack[T](num:Int) =
{
new EmptyMyStack[T]
}
}
abstract class MyStack[T](size:Int)
{
def data:T;
}
class EmptyMyStack[T] extends MyStack[T](0)
{
def data:Nothing = throw new Exception("empty stack");
}
The following video clip overviews this code sample, shows its execution and explains one of the main common cases in which we will use the Nothing type.
