title: Clarifying UML class diagram of Factory Method design pattern
body: <p>I was learning factory method design pattern and found following class diagram in a tutorial. I understand product and concreteProduct part but Creator and ConcreteCreator part look little vague to me. I appreciate if someone clarifies the UML diagram. Thanks.
  <a href="https://i.stack.imgur.com/N3mC1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/N3mC1.png" alt="enter image description here"></a></p>