Area of Circle in Java

This program to find the area of the circle
Formula:
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
This programs gets the input as radius of the circle from the user and do the calculation and display the result

Example:
Radius of a circle is 5
Then Result=3.14 * 5 * 5

Output:Area of a circle is 78.53981633974483

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class AreaOfCircle{
 
        public static void main(String[] args) {
               
                int radius = 0;
                System.out.println("Please enter radius of a circle");
               
                try
                {
                        //get the radius from console
                        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                        radius = Integer.parseInt(br.readLine());
                }
                //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);
                }
               
                double area = Math.PI * radius * radius;
               
                System.out.println("Area of a circle is " + area);
        }
}


Output:
Please enter radius of a circle 8
Area of a circle is 201.06192982974676