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At the end of this chapter you will

know the concepts of 

• Languages

• Principles of OOPs

•

Real world and computer software• Object factory

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Object oriented programming

• Provides easy approach

• Machine independent

• Understanding is very easy

High levellanguages

• Many instructions are written

• Instructions are grouped together to form functions

• Concentrates much on data items rather than functions

Procedure

oriented

• Modular approach

• Standardize the program by creating partition memoryfor both data and function

• Reusability of code

Object

oriented

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Principles of Object oriented

programming

Objects

Classes

Data

Abstraction

Encapsulation

Data Hiding

Inheritance

Polymorphism

Dynamic

Binding

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Object

• Unique identity which contains data and

functions (Characteristics and behavior)

Characteristic :

Colour and

shape

BehaviorWrite

Characteris

tics are considered as data members

Behavior is considered as functions

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Classes

• Class is a set of similar objects

• Each object has its own attribute and common

behavior

Rainbow is a class that contains amplitude, frequency, wavelength.

Objects are the different colors

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Data Abstraction

• Act of representing the essential features

without including the background details

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Encapsulation

• Wrapping up of data and function into a single

unit called class is encapsulation.

DATA + FUNCTION = CLASS

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Data Hiding

• Data that cannot be directly accessed outside

the class although they are available in the

same program.

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Inheritance

• Process by which objects of one class can link

and share some common properties of objects

from another class.

10

10 A 10 B 10 c

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Polymorphism

• Process of using a function for more than one

purpose.

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Dynamic Binding

• Process to link the function call with function

signature during run time.

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Object Factory

• Class is a prototype of an object

• Each objects has its own properties and

behavior

• As the class produces objects of similar type it

is termed as object factory

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Message passing

• Objects interact with each other

• They share the common properties and

behavior

• This concept is message passing

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Question session

• In OOP stress is given on _______

• A _____ is an object maker

• Combining data and function to an single entity is

called _______• Object acquiring the properties of another object

is called ______

•

In procedural programming the stress is on _____• Set of objects that have common attributes and

behavior is called________

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Question answers

What is OOP ?

Name any two OOP languages

Name the principles of OOP

Define object

Define a class

What is data hiding

Which technique can we adopt for data hiding ?

What is polymorphism

What is message passing?

Why is class called as object factory.