test objects design

## Ruby example for John
# Initializing instance variable on superclass. 
# class B is a subclass of A and inherits attribute a from superclass. 
# Then in B we add attribute b.

class A
  attr :a, true
end

class B < A
  attr :b, true
  def initialize(a,b)
    @a = a
    @b = b
  end
end

a = A.new
a.a = "value a for object a"
b = B.new("value a for object b", "value b for object a")
puts b.a
#b.b = "b"

puts "b.b is " + b.b
puts "b.a is " + b.a
puts "a.a is " + a.a

=begin
PRINTOUT WILL BE
value a for object b
b.b is value b for object a
b.a is value a for object b
a.a is value a for object a
=end