mymodule.rb

# kazzさん謹製
module MyModlue
  class BaseClass
    def public_method
      'called public_method'
    end

    def call_methods_with_self
      puts self.public_method rescue puts 'CANNOT call public_method'
      puts self.protected_method rescue puts 'CANNOT call protected_method'
      puts self.private_method rescue puts 'CANNOT call private_method'
    end

    def call_methods_without_self
      puts public_method rescue puts 'CANNOT call public_method'
      puts protected_method rescue puts 'CANNOT call protected_method'
      puts private_method rescue puts 'CANNOT call private_method'
    end

    protected

    def protected_method
      'called protected_method'
    end

    private

    def private_method
      'called private_method'
    end
  end

  class SubClass < BaseClass
    def call_methods_with_self
      puts self.public_method rescue puts 'CANNOT call public_method'
      puts self.protected_method rescue puts 'CANNOT call protected_method'
      puts self.private_method rescue puts 'CANNOT call private_method'
    end

    def call_methods_without_self
      puts public_method rescue puts 'CANNOT call public_method'
      puts protected_method rescue puts 'CANNOT call protected_method'
      puts private_method rescue puts 'CANNOT call private_method'
    end
  end

  class OtherClass
    def call_methods
      puts BaseClass.new.public_method rescue puts 'CANNOT call public_method'
      puts BaseClass.new.protected_method rescue puts 'CANNOT call protected_method'
      puts BaseClass.new.private_method rescue puts 'CANNOT call private_method'
    end
  end
end


puts '*** calling BaseClass self(with self) ***'
MyModlue::BaseClass.new.call_methods_with_self
puts

puts '*** calling BaseClass self(without self) ***'
MyModlue::BaseClass.new.call_methods_without_self
puts


puts '*** Calling subclass (with self) ***'
MyModlue::SubClass.new.call_methods_with_self
puts

puts '*** calling subclass (without self) ***'
MyModlue::SubClass.new.call_methods_without_self
puts

puts '*** calling inner module ***'
MyModlue::OtherClass.new.call_methods
puts

puts '*** calling outer module ***'
puts MyModlue::BaseClass.new.public_method rescue puts 'CANNOT call public_method'
puts MyModlue::BaseClass.new.protected_method rescue puts 'CANNOT call protected_method'
puts MyModlue::BaseClass.new.private_method rescue puts 'CANNOT call private_method'
puts