Composition with inheritance?

Question

my question is if it's possible/right to model something like this:

The problem is that tutorial can't exist without the lecture, BUT they're both very very similar in their attributes and methods, that's why I thought that maybe it could be easier to have an inheritance there. Thanks for the ideas and answers

Answer 1

That should work just fine. There is nothing wrong with your model .... though it is conventional to draw the diagram with the superclass above the subclasses, not below them as your diagram does.