object oriented Programming ppt

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Sajjad Ali Khan submitted a seminar on object-oriented programming that covered key concepts like classes, objects, messages, and design principles. The content included definitions of objects, classes, and messages. It discussed why OOP is used and requirements for object-oriented languages like encapsulation, inheritance, and dynamic binding. Popular OO languages were listed and concepts like polymorphism were explained with examples.

Submitted By:
Sajjad Ali Khan
B.tech (CSE)
Roll no - 1736210006
Session 2020-21

Content
 What is an Object?
 What is a Class?
What is a Message?
Why OOP?
Design Principles of OOP
 Requirements of Object-Oriented language
Step by step explanation
Conclusion
References

What is an Object?
An object is a software bundle of related variables and
methods. Software objects are often used to model real-
world objects you find in everyday life.
Visual representation of a software object A bicycle modeled as a software object

What is a Class?
A class is a blueprint or prototype that defines the variables
and the methods common to all objects of a certain kind.
 Class is an implementation of an abstract data type and
so encapsulates both data and operations.
 Object is run-time instance of class.
Classes just sit there, objects do the real work.
Memory is allocated for Objects not for Classes.

What is a Message?
Software objects interact and communicate with each
other using messages.
 The object to which the message is addressed (YourBicycle)
 The name of the method to perform (changeGears)
 Any parameters needed by the method (lowerGear)

To be object oriented, a language must support
 Encapsulation
 Inheritance
 Dynamic Binding
Some of the popular OO languages are
C++
Smalltalk
Java
Eiffel
FORTRAN90
CLOS(Common Lisp Object System)
Ada95
Modula-3

Encapsulation:
Packaging an object's variables within the protective
custody of its methods is called encapsulation.
Often, for practical reasons, an object may wish to expose
some of its variables or hide some of its methods.
Access Levels:
Specifier Class Subclass Package World
Private X
Protected X X X
Public X X X X

Most read

Dynamic Binding:
 Dynamic binding occurs when the type of variable changes at run-
time.
A common way for a variable to change its type is via assignment.
Bike:= MoutainBike is safe
MountainBike:=Bike is not safe
MountainBike is declared to have all the features of Bike so the
assignment does no harm.
 A variable that starts life of the type Bike may be attached to any
object that is a kind of Bike, including MountainBike,RacingBike,…
 A variable that starts life of the type MountainBike can only be
attached to MountainBike objects but does not include RacingBike or
general Bike.

Polymorphism:
 The ability to appear in many forms.
 In object-oriented programming,
polymorphism refers to a programming
language's ability to process objects differently
depending on their data type or class.
It is the ability to redefine methods for
derived classes.
E.g. e-bike Acceleration system.
Electronically / Mechanically

What is Inheritance?
A class inherits state and behavior from its superclass.
Inheritance provides a powerful and natural mechanism for
organizing and structuring software programs.
Super Class
Subclasses

Properties:
Each subclass inherits state (in the form of variable declarations) from the superclass.
Subclasses can add variables and methods to the ones they inherit from the superclass.
Subclasses can also override inherited methods and provide specialized
implementations for those methods.
You are not limited to just one layer of inheritance. The inheritance tree, or class
hierarchy, can be as deep as needed.
Benefits:
Re-Usability
Subclasses provide specialized behaviors from the basis of common elements provided
by the superclass. Through the use of inheritance, programmers can reuse the code in
the superclass many times.
Can define Abstract Classes
Programmers can implement superclasses called abstract classes that define "generic"
behaviors.

A
B
C
A B
C
A-1
A-2
B-1
B-2
AB
Multi-level Inheritance Multiple
Inheritance
Multiple Multi-level
Inheritance
Types of Inheritance:

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object oriented Programming ppt

1. Submitted By: Sajjad Ali Khan B.tech (CSE) Roll no - 1736210006 Session 2020-21

2. Seminar On Object-Oriented Programming

3. Content  What is an Object?  What is a Class? What is a Message? Why OOP? Design Principles of OOP  Requirements of Object-Oriented language Step by step explanation Conclusion References

4. What is an Object? An object is a software bundle of related variables and methods. Software objects are often used to model real- world objects you find in everyday life. Visual representation of a software object A bicycle modeled as a software object

5. What is a Class? A class is a blueprint or prototype that defines the variables and the methods common to all objects of a certain kind.  Class is an implementation of an abstract data type and so encapsulates both data and operations.  Object is run-time instance of class. Classes just sit there, objects do the real work. Memory is allocated for Objects not for Classes.

6. What is a Message? Software objects interact and communicate with each other using messages.  The object to which the message is addressed (YourBicycle)  The name of the method to perform (changeGears)  Any parameters needed by the method (lowerGear)

8. To be object oriented, a language must support  Encapsulation  Inheritance  Dynamic Binding Some of the popular OO languages are C++ Smalltalk Java Eiffel FORTRAN90 CLOS(Common Lisp Object System) Ada95 Modula-3

9. Encapsulation: Packaging an object's variables within the protective custody of its methods is called encapsulation. Often, for practical reasons, an object may wish to expose some of its variables or hide some of its methods. Access Levels: Specifier Class Subclass Package World Private X Protected X X X Public X X X X

10. 10

11. What is Inheritance? A class inherits state and behavior from its superclass. Inheritance provides a powerful and natural mechanism for organizing and structuring software programs. Super Class Subclasses

12. Properties: Each subclass inherits state (in the form of variable declarations) from the superclass. Subclasses can add variables and methods to the ones they inherit from the superclass. Subclasses can also override inherited methods and provide specialized implementations for those methods. You are not limited to just one layer of inheritance. The inheritance tree, or class hierarchy, can be as deep as needed. Benefits: Re-Usability Subclasses provide specialized behaviors from the basis of common elements provided by the superclass. Through the use of inheritance, programmers can reuse the code in the superclass many times. Can define Abstract Classes Programmers can implement superclasses called abstract classes that define "generic" behaviors.

13. A B C A B C A-1 A-2 B-1 B-2 AB Multi-level Inheritance Multiple Inheritance Multiple Multi-level Inheritance Types of Inheritance:

14. Dynamic Binding:  Dynamic binding occurs when the type of variable changes at runtime. A common way for a variable to change its type is via assignment. Bike:= MoutainBike is safe MountainBike:=Bike is not safe MountainBike is declared to have all the features of Bike so the assignment does no harm.  A variable that starts life of the type Bike may be attached to any object that is a kind of Bike, including MountainBike,RacingBike,…  A variable that starts life of the type MountainBike can only be attached to MountainBike objects but does not include RacingBike or general Bike.

15. Polymorphism:  The ability to appear in many forms.  In object-oriented programming, polymorphism refers to a programming language's ability to process objects differently depending on their data type or class. It is the ability to redefine methods for derived classes. E.g. e-bike Acceleration system. Electronically / Mechanically

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