bc0057 smu bca Winter 2014 VIth sem assignment

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PROGRAM: BCA (REVISED 2007)

SEMESTER: 6TH SEM

SUBJECT CODE & NAME: BC0057 – OBJECT ORIENTED ANALYSIS AND DESIGN

CREDIT: 4

BK ID: B1010

MAX. MARKS: 60

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Q.1: Why is object oriented system important? State 2 orthogonal views of the software.

ANS:

Object oriented systems are easier to adapt to changing requirements,easier to maintain, more robust, and promote greater design and codereuse.

·         Higher level of abstraction:

Q.2: Explain about Encapsulation & information hiding and Class hierarchy

ANS:

Encapsulation and information hiding:

Information hiding is the principle of concealing the internal data andprocedures of an object and providing an interface to each object insuch a way as to reveal as little as possible about its inner workings.

Q.3: Describe Rum Baugh et al.’s Object Modeling Technique

ANS:

The Object Modeling Technique (OMT) presented by Jim Rum Baugh andhis co-workers describes a method for the analysis, design, andimplementation of a system using an object-oriented technique. OMT is afast, intuitive approach for identifying and modeling all the objects making upa system. Details such

Q.4: Write short notes on: (i) Sequence Diagram (ii) Collaboration Diagram

ANS:

(i) Sequence Diagram:

A sequence diagram is an interaction diagram that emphasizes thetime ordering of messages. A sequence diagram shows a set of objectsand the messages sent and received by those objects. The objects aretypically named or anonymous instances of classes, but may also representinstances of other things, such as

Q.5: Explain the 3 steps in extracting Entity Classes with a flowchart.

ANS:

Entity class extraction consists of three steps that are carried out iteratively and incrementally:

·         Functional Modeling. Present scenarios of all the use cases (ascenario is an instance of a use

Q.6: What are the reasons that the operations not added during the analysis workflow, but rather during the design workflow? Explain.

ANS:

·         First, as explained, as a consequence of the iterative nature of the Unified Process, it is unwise to

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