Class and Objects in Java

What is JAVA classes

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.

class <class_name>{      field;      method;  }  

What is an 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.

Syntax

ClassName ReferenceVariable = new ClassName();

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.

Example Code: Class and Object

class Student

{
int id;
String name;
}
class TestStudent

{
public static void main(String args[])

{
//Creating objects
Student s1=new Student();
//Initializing objects
s1.id=101;
s1.name=”Sonoo”;
//Printing data
System.out.println(s1.id+” “+s1.name);
}
}