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Introduction To Object And Class In Java


Classes and objects are the fundamental components of OOP’s. Often there is confusion between classes and objects.

First, let’s understand what they are.

What is an object-based application?

An object-based Java application is a Java application whose design is based on declaring classes, creating objects from them, and designing interactions between these objects.

What is Class?

A class is an entity that determines how an object will behave and what the object will contain. In other words, it is a blueprint or a set of instruction to build a specific type of object.

What is Object?

An object is nothing but a self-contained component which consists of methods and properties to make a particular type of data useful. Object determines the behavior of the class. When you send a message to an object, you are asking the object to invoke or execute one of its methods.

From a programming point of view, an object can be a data structure, a variable or a function. It has a memory location allocated. The object is designed as class hierarchies.

What is the difference between Object & class?

A class is a blueprint or prototype that defines the variables and the methods (functions) common to all objects of a certain kind.

An object is a specimen of a class. Software objects are often used to model real-world objects you find in everyday life.

For example, picture above shows that with a blueprint of car you can build any specific car as you wish.

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