What is Class in Java?

A class is a blueprint used to create objects by defining their properties and behaviors.

Blueprint:
A class is called a blueprint because it defines the structure and behavior for objects, but does not create any object itself. It’s like a template.

• Variables => (Properties / Data)

• Methods => (Functions / Actions )

Example :

Car:

• Properties => (Color , model , Speed)

• Actions => (Star() , Stop() )

This one class , You can create many Objects

Class Rules:

• Starts with a Uppercase letter:

Example:
BankAccount

• Meaningful Name:

Example:
UserProfile

• Don't use the Special Charecters:

Except _ and $ it's technically allowed but using avoid.

Example:

StudentData

Student_Data ❌

• File Name = Class Name:

Must match the File Name and Class Name.

Example:

public class Home{
}

**File Name:** Home.java

• Do not use reserved keywords:

Java already have a keywords with a meaningful so they cannot be used class names , variable names , or method names.

Common Java Keywords:
int class if else for while static

• Prefer Singular names: A class usually represent a single object.

Example:
Home
Homes ❌