# Program to Calculate Area and Circumference of Circle in Java Example

by Dinesh Thakur Category: Classes

This example is used to calculate the area and circumference of a circle with given radius. The class Circle contains the field radius and methods setData (), area ()and circumference ().The statement.

Circle obj = new Circle();

creates a Circle object in memory and assign it to the reference variable obj,

The statement,

obj.setData(3.5) ;

assigns the radius field of the Circle object to 3.5 using the reference variable obj.

The statement,

obj.area ();

obj.circumference() ;

calculates the area and circumference of the corresponding Circle object, which is finally displayed.

```class circle

{

double radius; //radius of circle

void setData(double r)

{

radius = r;

}

void area ()

{

double circleArea = Math.PI * radius *radius;

System.out.println("Area of circle is = " + circleArea);

}

void circumference()

{

double cir = 2 * Math.PI * radius ;

System.out.println("circumference of circle is = " + cir);

}

}

public class AreaAndCircumference

{

public static void main(String[] args)

{

circle obj = new circle();

obj.setData(3.5 );  //call setData method

obj.area( );  //call area method

obj.circumference( );  //call circumference method

}

}

```

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Dinesh Thakur holds an B.C.A, MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.

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