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This is a lecture notes of the basic concepts of OOPS in Java
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OOPs ConceptsObject 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.
JAVA PROGRAMMING Page 1
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