My first singleton on Ruby

class Single
  private_class_method :new

  @@instance = nil

  def self.getInstance
    @@instance = new if @@instance == nil
    p "getInstance Call"
  end

  def initialize
    p "New instance!"
  end
end

obj1 = Single.getInstance
obj2 = Single.getInstance

#"New instance!"
#"getInstance Call"
#"getInstance Call"