Area of Circle in Java

This program to find the area of the circle and its get the radius from the user via the console by BufferedReader() class and do the calculations
and Show its output.
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
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
                {
                        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);
        }
}