dependency_injection_dynamic2_example.rb

class Monitor
  def initialize(videoConnector)
      self.videoConnector = videoConnector;
  end 
  
  def connectToDevice(device)
    if videoConnector.kind_of? DisplayPortCord
      videoConnector.connect(device);
    elsif videoConnector.kind_of? HdmiCord
      videoConnector.connectToSomething(device)
    end 
  end 

  private
  attr_accessor :videoConnector; 
end