Instance in Java

Difference between Object and Instance in Java

The instance is a specific occurrence of a class at runtime. It is created using the “new” keyword and represents the unique memory allocation with its own set of instance variables that store its state.

Syntax :

ClassName instanceName = new ClassName(arguments);

Below is the implementation of the above topic:

Java

import java.io.*; 
public class Circle { 
    int radius; 
  
    public double calculateArea() { 
        return Math.PI * radius * radius; 
    } 
  
    public static void main(String[] args) { 
        Circle circle1 = new Circle(); 
        circle1.radius = 5; 
        double area1 = circle1.calculateArea(); 
        System.out.println("Area of circle1 is " + area1); 
  
        Circle circle2 = new Circle(); 
        circle2.radius = 10; 
        double area2 = circle2.calculateArea(); 
        System.out.println("Area of circle2 is " + area2); 
    } 
}

Output

Area of circle1 is 78.53981633974483
Area of circle2 is 314.1592653589793

Difference Between Object and Instance in Java

The object is an instance of a class. A class is like a blueprint or template that defines the properties and behavior of objects. When we create an object we are creating an instance of that class.

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Object in Java