�ݺ�ߣ

By:
Nabeela Khan
Alina Asif
Sidra Bibi
2

 Object
◦ encapsulates both data (attributes) and data manipulation
functions (called methods, operations, and services)
 Class
◦ generalized description (template or pattern) that describes a
collection of similar objects
 Super-class
◦ a collection of objects
 Sub-class
◦ an instance of a class
3

 Class hierarchy
◦ attributes and methods of a super-class are inherited by its
sub-classes
 Messages
◦ the means by which objects exchange information with one
another
 Inheritance
◦ provides a means for allowing sub-classes to reuse existing
super-class data and procedures
◦ provides mechanism for propagating changes
4

 Polymorphism
◦ mechanism that allows several objects in an class hierarchy to
have different methods with the same name
◦ instances of each sub-class will be free to respond to
messages by calling their own version of the method
5

 Build new class from scratch without using
inheritance
 Use inheritance to create new class from
existing class contains most of the desired
attributes and operations
 Restructure the class hierarchy so that the
required attributes and operations can be
inherited by the newly created class
6

 Override some attributes or operations in an
existing class and use inheritance to create a
new class with (specialized) private versions of
these attributes and operations.
7

 Customer communication
 Planning
 Risk analysis
 Engineering construction and analysis
 Customer evaluation
8

 Identify candidate classes
 Look-up classes in library
 Extract classes if available
 Engineer classes if not available
◦ Object-oriented analysis (OOA)
◦ Object-oriented design (OOD)
◦ Object-oriented programming (OOP)
◦ Object-oriented testing (OOT)
 Put new classes in library
 Construct Nth iteration of the system
9

 External Entities
◦ devices or people
 Things in Problem Domain
◦ Reports, displays, signals
 Events
◦ completion of some task
 Roles
◦ manager, engineer, salesperson
 Organizational Units
◦ divisions, groups, teams
 Structures
◦ sensors, vehicles, computers
10

 Does object information need to be retained?
 Does object provide a set of needed services that can
change its attributes?
 Does object have major (important) attributes?
 Can you identify common attributes for all object
instances?
 Can you identify common operations for all object
instances?
 Is it an external entity that produces or consumes
information?
11

 Establish a common process framework (CPF).
 Use CPF & historic data to eliminate time & effort.
 Specify products & milestones.
 Define Q.A. checkpoints.
 Manage changes.
 Monitor project.
12

 Contracts completed.
 Object-Oriented Analysis completed.
 Object-Oriented Design completed.
 Object-Oriented Programming completed.
 Object-Oriented Testing completed.
13

 Number of scenario scripts.
 Number of key classes.
 Number of support classes.
 (# key classes)/(# support classes).
 Number of major iterations (around spiral
model).
 Number of completed contracts.
14

�ݺ�ߣ

Softwear presentation

Recommended

More Related Content

What's hot (13)

Viewers also liked (17)

Similar to Softwear presentation (20)

Recently uploaded (20)

Softwear presentation