Final functions and properties

If you use the final modifier on a function or a property, the final modifier prevents a subtype from overriding that item. For example, a subclass of a Gosu class cannot reimplement a method that the superclass declares as final.

For example, the following code defines a class with a final function and final properties:

package com.mycompany

class Auto {

  // A final property -- no subtype can reimplement or override this property!
  final property get Plate() : String
  final property set Plate(newPlate : String)

  // A final function/method -- no concrete subtype can reimplement or override this function!
  final function RegisterWithDMV(registrationURL : String)
}