Class notes JAVA

OOPs Concepts
Object Oriented Programming is a paradigm that provides many concepts such as
inheritance, data binding, polymorphism etc.

Simula is considered as the first object-oriented programming language. The programming paradigm
where everything is represented as an object is known as truly object-oriented programming language.

Smalltalk is considered as the first truly object-oriented programming language.

OOPs (Object Oriented Programming System)

Object means a real word entity such as pen, chair, table etc. Object-Oriented Programming is a
methodology or paradigm to design a program using classes and objects. It simplifies the software
development and maintenance by providing someconcepts:

o Object
o Class
o Inheritance
o Polymorphism
o Abstraction
o Encapsulation

Object

Any entity that has state and behavior is known as an object. For example: chair, pen, table,
keyboard, bike etc. It can be physical and logical.

Class

Collection of objects is called class. It is a logical entity.

Inheritance
When one object acquires all the properties and behaviours of parent object i.e. known as
inheritance. It provides code reusability. It is used to achieve runtime polymorphism.




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