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Java Example to find the area of a circle

Sep 02 2011

Java Programming Example

The Java programming example is to find the area of a circle

Calculate Circle Area using Java Example

This Calculate Circle Area using Java Example shows how to calculate area of circle using it’s radius.




public class CalculateCircleAreaExample {

public static void main(String[] args) {

int radius = 0;

System.out.println(“Please enter radius of a circle”);



//get the radius from console

BufferedReader br = new BufferedReader(new InputStreamReader(;

radius = Integer.parseInt(br.readLine());


//if invalid value was entered

catch(NumberFormatException ne)


System.out.println(“Invalid radius value” + ne);



catch(IOException ioe)


System.out.println(“IO Error :” + ioe);




* Area of a circle is

* pi * r * r

* where r is a radius of a circle.


//NOTE : use Math.PI constant to get value of pi

double area = Math.PI * radius * radius;

System.out.println(“Area of a circle is ” + area);




Output of Calculate Circle Area using Java Example would be

Please enter radius of a circle


Area of a circle is 1134.1149479459152


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