OOP (Object-Oriented Programming)

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

Object
Class
Inheritance
Polymorphism
Abstraction
Encapsulation

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Object
Java Object

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

An Object can be defined as an instance of a class. It contains an address and takes up some space in memory. Objects can communicate without knowing the details of each other’s data or code.

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

A class can also be defined as a blueprint from which you can create an individual object. Class does not consume any space.

原文链接：OOP (Object-Oriented Programming)