OOAD
Placement Training
Prepared by G.Naveen Sundar, Karunya University
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WHAT DO YOU MEAN BY ANALYSIS
AND DESIGN?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
Analysis:
Basically, it is the process of determining what needs to
be done before how it should be done. In order to
accomplish this, the developer refers the existing systems
and documents. So, simply it is an art of discovery.
Design:
It is the process of adopting/choosing the one among
the many, which best accomplishes the users needs. So,
Prepared by G.Naveen Sundar, Karunya University
simply, it is compromising mechanism.
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WHAT ARE THE STEPS INVOLVED IN DESIGNING?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
 Before getting into the design the designer should go
through the SRS prepared by the System Analyst.
 The main tasks of design are Architectural Design and
Detailed Design.
 In Architectural Design we find what are the main modules
in the problem domain.
 In Detailed Design we find what should be done within
each module.
Prepared by G.Naveen Sundar, Karunya University
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What are the main underlying
concepts of object orientation?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
Objects, messages, class, inheritance and
polymorphism are the main concepts of
object orientation.
Prepared by G.Naveen Sundar, Karunya University
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What do u meant by "SBI" of an
object?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
SBI stands for State, Behaviour and Identity.
State:
It is just a value to the attribute of an object at a particular time.
Behaviour:
It describes the actions and their reactions of that object.
Identity:
An object has an identity that characterizes its own existence. The
identity
makes
it
possible
Prepared by G.Naveen Sundar, Karunya University
to
distinguish
any
unambiguous way, and independently from its state.
object
in
an
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Differentiate persistent & nonpersistent objects?
Prepared by G.Naveen Sundar, Karunya University
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Answer:

Persistent refers to an object's ability to transcend
time or space. A persistent object stores/saves its
state in a permanent storage system with out losing
the information represented by the object.
 A non-persistent object is said to be transient or
ephemeral. By default objects are considered as
non-persistent.
Prepared by G.Naveen Sundar, Karunya University
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What do you meant by active
and passive objects?
Prepared by G.Naveen Sundar, Karunya University
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 Active objects are one which instigate an interaction
which owns a thread and they are responsible for
handling control to other objects. In simple words it can
be referred as client.
 Passive objects are one, which passively waits for the
message to be processed. It waits for another object that
requires its services. In simple words it can be referred as
server.
Prepared by G.Naveen Sundar, Karunya University
13
What is meant by software
development method?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
 Software development method describes how
to model and build software systems in a
reliable and reproducible way.
 To put it simple, methods that are used to
represent ones' thinking using graphical
notations.
Prepared by G.Naveen Sundar, Karunya University
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What are models and meta
models?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
 Model:
It is a complete description of something (i.e.
system).
 Meta model:
It describes the model elements, syntax and
semantics of the notation that allows their
manipulation.
Prepared by G.Naveen Sundar, Karunya University
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What do you meant by static
and dynamic modeling?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
Static modeling is used to specify structure of the
objects that exist in the problem domain. These are
expressed using class, object and USECASE diagrams.
But Dynamic modeling refers representing the object
interactions during runtime. It is represented by
sequence, activity, collaboration and state chart
diagrams.
Prepared by G.Naveen Sundar, Karunya University
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What is an USECASE? Why it is
needed?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
Use Case is a interaction between
actor(USER) and System (application),
for single system there many use
cases depends on Requirements.
Prepared by G.Naveen Sundar, Karunya University
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Who is an actor ?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
 An Actor is something or someone who interact
with the system under development. An actor
can be a Human, device or an external
system. An actor can be a giver / receiver of
information or both.
Prepared by G.Naveen Sundar, Karunya University
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What factors you will consider
before starting UML designs?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
1)Functional Requirements.
2)Entities possible in proposed Application.
3)Activities and processes possible in Application.
4)Possible states of objects of entities in propose
application.
5)Relationship of objects or entities in proposed
application.
Prepared by G.Naveen Sundar, Karunya University
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How to define the models in the
UML diagrams?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
A model is a simplification of reality. A model
provides the blueprint of a system. Models helps us
to visualize a system as it is or as we want it to be.
Models permit us to specify the structure or
behaviour of a system. Model gives us a template
that guides us in constructing a system. Model
documents the decisions we have made.
Prepared by G.Naveen Sundar, Karunya University
27
Define Aggregation Relation ship
with example?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
Aggregation is the relationship between the
whole and a part. We can add/subtract some
properties in the part (slave) side. It won’t affect
the whole part.
Best example is Car, which contains the wheels
and some extra parts. Even though the parts are
not there we can call it as car.
Prepared by G.Naveen Sundar, Karunya University
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Define Containment Relation
ship with example?
Prepared by G.Naveen Sundar, Karunya University
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Answer:

containment relationship is the
whole part is affected when the
part within that got affected.
The human body is an apt
example for this relationship. When
the whole body dies the parts
(heart, lungs etc) also dies.
Prepared by G.Naveen Sundar, Karunya University
31
Explain two external
responsibilities of a project
manager.
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Answer:
 Establish working relationships with users to
secure the requirements
 Establish working relationships with the sponsor to
secure senior management support
 Identify needs and secure resources
 Report on project status and progress
Prepared by G.Naveen Sundar, Karunya University
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What is meant by realization ?
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Answer:
 Realization is a kind of relationship that exist
between classes in class diagram which is
used to denote that an interface is realized or
implemented by a class. Also this
is used to relate two use cases.
Prepared by G.Naveen Sundar, Karunya University
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What are the four phases of the
Unified Process ?
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Answer:
 Inception Phase
 Elaboration Phase
 Construction Phase
 Transition Phase
Prepared by G.Naveen Sundar, Karunya University
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Difference between OOA and
OOD
Prepared by G.Naveen Sundar, Karunya University
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Answer:
OOA focuses on what the system does, OOD
on how the system does it.
Prepared by G.Naveen Sundar, Karunya University
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Is class an Object? Is object a
class?
Prepared by G.Naveen Sundar, Karunya University
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Answer:
 A class is just a template that is used to create
the objects and to define its behaviours.
 But object is an instance of a class.
Prepared by G.Naveen Sundar, Karunya University
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Thank you
Prepared by G.Naveen Sundar, Karunya University
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