Class and Object in java

What is class?

• A class in Java is a Blueprint or template from which an object is created. The object is defined by the Structure and behaviour(methods) that objects of that class will possess.

• It is a logical entity.

• No memory is allocated when a class is defined.

• All classes are non-primitive datatypes.

How to create a class?

**
BASIC SYNTAX for creating a class:**

public class Car
{
    // Data members (fields)- hold  the actual value

String brand;
int speed;
    //Behaviour (method)
void drive()

{
System.out.println("driving a car");
}


}
//But it’s not a real car yet. It’s just the plan.

Class Name Rules:

1. Must start with an Uppercase first letter or (_) underscore or dollar sign ($).
2. can not start with a number
3. cannot contain spaces or special characters
4. Use Pascal-case for naming

What is an Object?

• An object is an instance of a class, and it has its own memory copy. It is a physical entity. An object is created with the new keyword.

• When a class is created, no memory is used. Memory is allocated only when an object is created from that class.

Creating an Object :
classname, reference var,assignment operator,new keyword,classname();

Student id = new Student();