Topic: Dependency in Class Diagrams

Dependency in Class Diagrams

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Posted By: thats_Fine
Posted On: Wednesday, October 27, 2004 08:55 AM

Experts,

I have two classes Class1 and Class2.

An instance(object ) of Class1 has an instance(object) of Class2(i.e. aggregation).

There is a third class Class3, which uses an instance of Class1(dependency). Class3 also uses the instance of Class2 contained inside Class1 instance.

Now my question is: When I draw a class diagram, should I show only one dependency (i.e. Class3 dependson Class1) or 2 dependencies(Class1-Class3 and Class2-Class3)?
Please guide me.

Thanks,
ARUN

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Re: Dependency in Class Diagrams

Posted By: Amir_Pashazadeh
Posted On: Wednesday, October 27, 2004 02:12 PM

I think you should draw Class3-Class2 dependency to, because:

Class1 may have association (or aggregation) with other objects that Class3 doesn't know anything about them, you must distinguish them somehow

Changes to Class2 interface or implementation affects Class3, so there is a real dependency between them.

Amir Pashazadeh

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