How to show class contained as attribute in another class

UML
1

Hi,

I am a beginner with UML, so please forgive the basic nature of this question.

I wish to depict the following common situation on a UML 2 class diagram:

classA {}

classB
{
  private: classA myIdentifier;
}

My question is: on the diagram, do I add an attribute to ClassB and give this the type ClassA or do I omit the attribute and put both classes on the diagram with an association between them? Or do I do both?

What is the preferred (correct?) way of showing this?

Any help or advice would be very much appreciated.

Best wishes, Patrick Skelton

2

Hi Patrick,

Please see if the image attached is what you are looking for.

Best regards,
Jick

uml-questions-FM2490s.png