Birla Institute of Technology & Science, Pilani
Work-Integrated Learning Programmes Division
Second Semester
2015-2016
Comprehensive Examination
(EC-3 Regular)
Course No. : SS ZG514
Course Title : OBJECT ORIENTED ANALYSIS &
DESIGN
Nature of Exam : Open Book
Weightage : 50%
Duration : 3 Hours
Date
of Exam : 10/04/2016 (FN)
No
of pages: 3
No
of questions: 5
Note:
1. Please follow all the Instructions
to Candidates given on the cover page of the answer book.
2. All parts of a question
should be answered consecutively. Each answer should start from a fresh
page.
3. Assumptions made if any,
should be stated clearly at the beginning of your answer.
Q.1. SOLID
is an acronym of acronyms.
(a)
Write the full form of each of the 5 acronyms which
collect to form SOLID. [2.5]
(b)
Explain each in one line. [2.5]
(c)
Give an example to explain each. [5.0]
Q.2. Described
below are 5 creational patterns.
(a)
Identify each. [2.5]
(b)
Explain your choice. [2.5]
(c)
Explain the key feature of the mechanism that achieves
the requirements of GRASP under the heading “creator” in each of the patterns. [5.0]
Description
of 5 Creational Patterns
I.
It define an interface for creating an object, but let
subclasses decide which class to instantiate. A Method lets a class defer
instantiation to subclasses (dependency injection).
II.
It provide an interface for creating families of
related or dependent objects without specifying their concrete classes.
III.
Ensure a class has only one instance, and provide a
global point of access to it.
IV.
Specify the kinds of objects to create using a prototypical
instance, and create new objects by copying this prototype.
V.
Separate the construction of a complex object from its
representation allowing the same construction process to create various
representations.
SS ZG514 (EC-3 Regular) Second Semester 2015-2016 Page 2
Q.3. Draw the class diagram for the code given below:
(a)
Identify the Classes. [2.5]
(b)
Identify tthe attributes and methods. [2.5]
(c)
Draw the diagram clearly showing the associations
between classes. [5.0]
/**
* @opt
operations
* @opt attributes
* @opt types
* @hidden
*/
class UMLOptions {}
/* Define some types we use */
/** @hidden */
class Name {}
/** @hidden */
class Number {}
/**
* @has 1..*
Member * Student
* @composed 1..*
Has 1..* Department
*/
class School {
Name
name;
String
address;
Number
phone;
void
addStudent() {}
void
removeStudent() {}
void
getStudent() {}
void
getAllStudents() {}
void
addDepartment() {}
void
removeDepartment() {}
void
getDepartment() {}
void
getAllDepartments() {}
}
/**
* @has 1..*
AssignedTo 1..* Instructor
* @assoc 1..* -
1..* Course
* @assoc 0..* -
"0..1 chairperson" Instructor
*/
class Department {
Name
name;
void
addInstructor() {}
void
removeInstructor() {}
void
getInstructor() {}
void
getAllInstructors() {}
}
/**
* @assoc *
Attends * Course
*/
class Student {
Name
name;
Number
studentID;
}
class Course {
Name
name;
Number
courseID;
}
/**
* @assoc 1..*
Teaches * Course
*/
class Instructor {
Name
name;
}
SS ZG514 (EC-3 Regular) Second Semester 2015-2016 Page 2
Q.4. You
have a Square class that
derives from a Rectangle class. Assuming getter and setter methods exist for
both width and height. The Square class always assumes that the width is equal to
the height. If a Square object is used in a context where a Rectangle is
expected, unexpected behavior may occur because the dimensions of a Square
cannot (or rather should not) be modified independently.
(a)
Comment on the
application of LSP in this case. [2.5]
(b)
Comment on the
above if there were no setter methods. Parameters can only be passed by
constructors [2.5]
(c)
What are
the constraints specified in LSP with respect to precondition, postcondition
and invariants. Explain with an example. [5.0]
Q.5. The
Gang of four patters support the principles indicated in GRASP.
(a)
In the box
given below mark a tick in the squares to show a relation between the 5
patterns in the x-axis with 6 patterns in the y-axis. [2.5]
(b)
Explain the problem addressed by each of the 5
patterns to show how the 6 patterns on the y-axes help to address these
problems. [5 x
1.5 = 7.5]
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Adapter
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Factory
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Singleton
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Composite
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Strategy
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Low coupling
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High cohesion
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Polymorphism
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Pure fabrication
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Indirection
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Protected Variation
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