design-patternsumlclass-diagramcomposite
What is the difference between a composite pattern expressed with arrow point to component and one without?
I am designing a program and I would like to make use of the composite pattern. I have noticed that there are two ways of expressing it:
and
What is the difference between the two? Thank you!
Solution
As @alper already states there is no real difference between both notations.
The top one allows navigation in both directions (so Component can see Composite namely as parent) while the lower one does not have this navigability. To make make the missing parent relation more obvious the author has added the arrow.
So the top one is a more universal implementation of the Composite pattern.
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