Is there a way in a UML class diagram to indicate how many instances of a given class will be present in your system?
I know you can indicate the multiplicity of a relationship between classes:
Dog * ----------- 1 Yard 1 ----------- * Tree
But is there a common way to visually depict that there is exactly say, five instances of Yard in the model?
You cannot express this directly with UML bit with OCL (Object Constraint Language). It would be an invariant of Yard like
context Yard inv: Yard.allInstances()->size()=5
OCL is a language designed to express formal constraints when modelling with UML.