Introduction to OOP

19Z305OBJECT
ORIENTED
PROGRAMMING
Unit 1

11/20/2020 Vani Kandhasamy,PSG Tech 2

Overview
 Features of OOP
 Abstraction
 Classes and Objects
 Encapsulation
 Inheritance
 Polymorphism

Problem Sheet
1
Suppose you want to automate saving account system of a bank.
Each account, has following information
Account No, Account Holder Name, Balance
Following Bank branch operations
Open an account
Deposit money into a account
Withdraw Money from Account
Transfer money between accounts
Get Account details
Close an account

Procedural
Programming

Procedural
Programming
 Principle: Functional Decomposition
 Drawback:
 Hard to include new features
 Spaghetti code

Features of
OOP

Classes &
Objects
Class <class name> {
}
Data Members
Methods
How to represent Box as Class?

Classes &
Objects
Class <class name> {
}
Data Members
Methods
Objects

Abstraction
Goal: to handle complexity by hiding unnecessary details from the user

Encapsulation
Goal: binding object members and methods together and to keep
them safe from external interference
Encapsulation Data Hiding Abstraction

Access
Specifiers

Encapsulation

Inheritance
Inherit common behaviors

Inheritance
Goal: to improve reusability of the code and reduce redundant
code
BankAccount
-withdraw()
-deposit()
-transfer()
SavingsAccount
-calculateInterest()
CurrentAccount
-calculateCharges()

Polymorphism
Ability to appear in many forms

References
 "Java:The Complete Reference” by Schildt H - Part 1 - Chapter 2
 https://www.w3schools.com/java/
 https://docs.oracle.com/javase/tutorial/java/TOC.html

Introduction to OOP

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