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Classes and Objects



It is basically a collection of objects. It is a template which creates objects that defines its state and behavior. A class contains field and method to define the state and behavior of its object.

Syntax for Declaring Class:

<Access_Modifier> class <Class_Name>


Class_Name: It describes the class name which defines by using class keyword.

Access_Modifier : It defines the scope of the data member, method or class i.e.  who can access class and members of the class. There are three access modifiers in java:

  • Public – Accessible everywhere
  • Default – Accessible only within the package. If you not using any modifier then default is considered
  • Private – Accessible only within the class
  • Protected – Accessible within package and outside the package but during inheritance only



public class Fruit{

String name;  // field

String color;  // field

void vitamin(){  // method


void taste(){  // method





An object is an instance of a class. It has state and behavior. For example a fruit has states – name, color and behaviors – vitamin, taste


Keyword new is used to create object of class.

<Class_Name>   Object_Name = new <Class_Name>();


Fruit f = new Fruit ();


To access the method of class use the following syntax:



public class Addition{

int sum;

public void total(int a, int b){

sum = a + b;

System.out.println("Addition of two numbers:" +sum );


public static void main(String []args){

Addition add = new Addition ();, 20);




Addition of two numbers: 30

Learn more about Cross-Platform Mobile Technology for Android and iOS using Java in this insightful blog now!

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