Calculate Area of a Circle

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class CircleArea{

public static void main(String[] args) {

int radius = 0;

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

try

{

BufferedReader br =

new BufferedReader(new InputStreamReader(System.in));

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

}

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);

}

double area = Math.PI * radius * radius;

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

}

}