Simple Area & Perimeter of Circle Program in JAVA.

import java.io.*;
import java.lang.*;
class CircleArea{
    public static void main(String[] args){
        int r=0;
            try{
                BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
                System.out.println("Enter Radius of Circle  : ");
                r = Integer.parseInt(br1.readLine());
                double area = Math.PI*r*r;
                System.out.println("Area of Circle : "+area);
                double  perimeter =2*Math.PI*r ;
                System.out.println("Perimeter of Circle : "+perimeter);
            }
            catch(Exception e){
                System.out.println("Error : "+e);
            }
    }
}