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## Friday, September 2, 2011

### A Simple Example of Writing Code in Java

Java Programming Example

This 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.

import java.io.IOException;

public class CalculateCircleAreaExample {

public static void main(String[] args) {

int radius = 0;

try

{

//get the radius from console

}

//if invalid value was entered

catch(NumberFormatException ne)

{

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

System.exit(0);

}

catch(IOException ioe)

{

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

System.exit(0);

}

/*

* 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