oop - Is there any difference between UML Use Case "extends" and inherance? -

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or "extends" use case inheriting another?

--update

just clarification, i've read books , made lot of diagrams. can't see difference between extends on uml , on inherance. bill said, uml extends indicates optional behavior, in inherance either new behavior can or not use. so, what's difference?

this similar inheritance. see detailed description of concept here.

enjoy!


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