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Difference: Activity Diagram and Sequence Diagram.
 Question Submitted By :: Yogveer Singh
I also faced this Question!!     Rank Answer Posted By  
  Re: Difference: Activity Diagram and Sequence Diagram.
# 1
Activity Diagram mainly represent process flows captured in

Sequence diagram mainly represent interaction between
different objects.It is time ordered means exact
interactions between objects is represented step by step.
Is This Answer Correct ?    73 Yes 9 No
  Re: Difference: Activity Diagram and Sequence Diagram.
# 2
Sequence diagram describes the behavior of several objects
in a single use case.
activity diagrams are good at showing the general sequence
of actions for several objects and use cases.
Is This Answer Correct ?    35 Yes 7 No
Dharmendra Verma
  Re: Difference: Activity Diagram and Sequence Diagram.
# 3
In UML Activity diagram is used for functional modeling
while sequence diagram is used to dynamic modeling purpose.

A typical workflow can be repersented by activity diagram
while sequence diagram is more about exploring into use
case by showing intercation between objects.

Note: Activity diagram also repersents an object role in
workflow like sequence diagram but level of repersenation
is not dynamic like sequence diagram repersentation.

for example: Object lifeline and sequence of interaction
is detailed in sequence diagram while activity diagram does
not show such detail about an object.
Is This Answer Correct ?    27 Yes 5 No
Kumar Rohit
  Re: Difference: Activity Diagram and Sequence Diagram.
# 4
activity diagram is not dynamic diagram and it is used to
see the workflow of the software.
And sequence diagram is lifeline of the the object and it
isd dynamic modeling.
Is This Answer Correct ?    8 Yes 7 No
  Re: Difference: Activity Diagram and Sequence Diagram.
# 5
give examples for both of them 
Is This Answer Correct ?    7 Yes 1 No

Other UML Interview Questions
  Question Asked @ Answers
Can we use UML for user interface (UI) design? TCS 2
What do you mean by "Realization"?   8
What is the difference between static and dynamic Classificaition.Give some examples.   3
UML: IS it a process, method or notation? Protech 3
What is the purpose of a use case diagram? Satyam 12
What are the good practices to use while designing for reuse?   1
How do you represent static members and abstract classes in Class Diagram?   2
What factors you will consider before starting uml designs? HCL 2
Can we use UML for user interface (UI) design? Protech 3
what is difference between old & new version of uml?   1
Rational rose Vs Staruml please highlight the advantages and disadvantages in them and between them.   1
Explain Class Diagram in Detail.   4
For more UML Interview Questions Click Here 

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