gistfile1.rb

module Hoge1
   def hoge1_method
      puts "public geba"
   end
end

module Hoge2
   private
   def hoge2_method
      puts "private geba"
   end
end


class Foo
   include Hoge1
   include Hoge2
   def foo_method
      hoge1_method
      hoge2_method
   end

   def foo_method2
      self.hoge1_method
      self.hoge2_method
   end
end

Foo.new.foo_method # => "public geba\nprivate geba"
Foo.new.foo_method2 # => これではhoge2_methodがprivateなためエラーと成る