This demo is to introduce ways of defining static methods in ruby. Generally utility classes will not store any state information and thread safe.
# Demo for defining utility methods in ruby # In Java it is known as static methods module Universe module Earth def sayHello puts "Hello from earth!" end def sayHi puts "Hi from earth!" end def sayBye puts "Bye from earth!" end end end module Universe module Moon class << self include Universe::Earth private def foobar puts "Hello from foobar!" end end end end Universe::Moon.sayHello