Difference: 'uses', 'extends', 'includes'
- 7 Answers
- 38172 Views
- Cognizant, Protech, TY, University, I also Faced
- E-Mail Answers
Answer Posted / julian c
Include vs extends is nothing to do with 'always' or 'sometimes'. In UML 2.x these are dependency arrow stereotypes.
If the base use case is incomplete... i.e. we can not write, build, test and use it without the linked use case then it is MANDATORY that the other use case exists; this requires and <<include>>. Getting hung up on the always/sometimes issue is counter-productive.
If we can write, build, test and use the base use case without the linked use case existing at all then it is NOT dependent on it; the linked use case however describes how it may add functionality to the base use case - THAT'S WHY THE ARROW IS THE OTHER WAY and is stereotyped <<extend>>. The extending use case is OPTIONAL in that we may or may not provide that functionality at all.
The included use case is like a sub function that is called.
An extend use case can change any aspect of the base use case and in several places. Look at it this way; if I use MSWord to open the base use case, turn on track-changes and then edit it to represent changes I want to make (usually but not limited to additional functionality) the extending use case represents those tracked changes.
<<uses>> is UML 1.x and although still prominent in Visio Use Case stencils (finally fixed in Visio 2013) is deprecated.
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
Why is message passing between the objects important?
Can you create an instance of an abstract class?
What if we make the method as abstract in another interface?
What do you mean by virtual function and virtual classes?
Explain static binding
What is difference between class and interface?
What is constructor and virtual function? Can we call virtual funciton in a constructor?
Explain about inheritance in oops?
Define Initialisation Purpose.
Explain about polymorphism?
What are abstract methods?
What is operator overloading?
State about java and its relation to object oriented programming?
What is the main advantage of using inheritance?
What is the difference between oop and sop?
