You can use modules to define namespaces using the following code:
module ToolBox class Ruler # ww w .ja v a2 s . c o m attr_accessor :length end end module Country class Ruler attr_accessor :name end end a = ToolBox::Ruler.new a.length = 50 b = Country::Ruler.new b.name = "test"
Here, the Ruler classes were accessed by directly addressing them via their respective modules as ToolBox::Ruler and Country::Ruler.
include Country c = Ruler.new c.name = "test"
The Country module's contents which is the Ruler class are brought into the current scope.
You can use Ruler as if it's a local class.
To use the Ruler class located under ToolBox, you can still refer to it directly as ToolBox::Ruler.