Java Classes And Objects Explained | Java Tutorial 2023 | Java Programming | Parnika Tutorials

Publicado em: 09 Fevereiro 2022
no canal de: Parnika Tutorials

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"Java Classes And Objects Explained | Java Tutorial For Beginners 2023 | Java Programming | Parnika Tutorials

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00:00 - Introduction
01:05 - Class and Object
03:40 - Syntax of a class and object
12:05 - How to create an object
19:50 - Implementation in Notepad++

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A class is a user defined blueprint or prototype from which objects are created. It represents the set of properties or methods that are common to all objects of one type. In general, class declarations can include these components, in order:

Modifiers: A class can be public or has default access (Refer this for details).
class keyword: class keyword is used to create a class.
Class name: The name should begin with an initial letter (capitalized by convention).
Superclass(if any): The name of the class’s parent (superclass), if any, preceded by the keyword extends. A class can only extend (subclass) one parent.
Interfaces(if any): A comma-separated list of interfaces implemented by the class, if any, preceded by the keyword implements. A class can implement more than one interface.
Body: The class body surrounded by braces, { }.

It is a basic unit of Object-Oriented Programming and represents the real life entities. A typical Java program creates many objects, which as you know, interact by invoking methods. An object consists of :

State: It is represented by attributes of an object. It also reflects the properties of an object.
Behavior: It is represented by methods of an object. It also reflects the response of an object with other objects.
Identity: It gives a unique name to an object and enables one object to interact with other objects.

Example of an object: dog

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