examples/rosettacode/abstract_type.nit

   1 #!/usr/bin/env nit
   2 #
   3 # This file is part of NIT ( http://www.nitlanguage.org ).
   4 # This program is public domain
   5
   6 # Task: abstract type
   7 # SEE: <http://rosettacode.org/wiki/Abstract_type>
   8 #
   9 # Methods withouts implementation are annotated `abstract`.
  10 #
  11 # Abstract classes and interfaces can contain abstract methods and concrete (i.e. non-abstract) methods.
  12 # Abstract classes can also have attributes.
  13 module abstract_type
  14
  15 interface Inter
  16         fun method1: Int is abstract
  17         fun method2: Int do return 1
  18 end
  19
  20 abstract class Abs
  21         fun method1: Int is abstract
  22         fun method2: Int do return 1
  23         var attr: Int
  24 end