Pub/Pri class methods in ruby

gistfile1.txt

class Herp
 class << self
   private 
    def foo
     "foo"
    end
    public
    def bar
     "bar"
    end
  end
end

1.9.3p194 :062 > Herp.foo
NoMethodError: private method `foo' called for Herp:Class
	from (irb):62
	from /Users/dlikhten/.rvm/gems/ruby-1.9.3-p194-perf@doorsteps/gems/railties-3.2.8/lib/rails/commands/console.rb:47:in `start'
	from /Users/dlikhten/.rvm/gems/ruby-1.9.3-p194-perf@doorsteps/gems/railties-3.2.8/lib/rails/commands/console.rb:8:in `start'
	from /Users/dlikhten/.rvm/gems/ruby-1.9.3-p194-perf@doorsteps/gems/railties-3.2.8/lib/rails/commands.rb:41:in `<top (required)>'
	from script/rails:6:in `require'
	from script/rails:6:in `<main>'
1.9.3p194 :063 > Herp.bar
 => "bar"