UML association multiplicity

Question

I have a question about association multiplicity. I understand it, but for example if I would have:

 ---------            ---------
|         |1      *  |            


        

Answer 1

No,the * means not that there's at least one Student in each Class at any time. But the other direction, looking from Student to Class, the multiplicity means that any student is in exactly one Class.

For modelling reasons you might want to change the 1 multiplicity also to *, but this depends on your context.