Subject- Object Oriented Software Engineering. Topic- Designing a class diagram for "Online Examination System" + Basic Concept of Class diagram + Creating class Diagram + Relationship between classes + Access specifier

1. Class Diagram
for
ONLINE
EXAMINATION
SYSTEM

2. Objective
 Basic concept of class diagram.
Creating the class diagram for
“Online Examination System”.
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3. Basic Concepts
╺ Class: A class is a description of a set of objects that share the same
attributes, operations and relationships.
╺ Class Diagram: A class diagram is a type of static structure
diagram that describes the structure of a system by showing the
system's classes.
╺ A class may also includes its responsibilities in the class diagram
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4. A class diagram is made up of :
 A set of classes
 A set of relationship between the
classes
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5. Class:
 A class represent a concept which
encapsulates state and behavior
Each attribute has a type.
• Every class has a name.
• Different types of attributes.
• Operations of that class.
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6. Purpose of the class Diagram
•Analysis and design of the static view of an
application.
•Describe responsibilities of a system.
•It is used as a base for component and
deployment diagram.

7. “
Class Diagram for the system
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8. Classes used for the Diagram:
Admin
Website
Database
Examiner
Exam
Student
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9. Relationships used in the diagram:
Association
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Association
Here, I have used
association relation
between these classes.
These classes can directly
interact with the other
classes.
Association

10. Dependency
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Here, I have used the
dependency
relationship between
this two class – Website
class and database
class.
Website is depended on
the database.
Dependency

11. Access Specifiers:
There are mainly there access specifiers used,
Public (symbol= ‘+’)
Private (symbol=‘-’)
Protected (symbol=‘#’)
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12. Thank You
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