Write a program to calculate area and perimeter of a circle

Here is the code of the program:

import java.io.*;
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 = java.lang.Math.PI*r*r;
       System.out.println("Area of Circle : "+area);
       double  perimeter =2*java.lang.Math.PI*r ;
       System.out.println("Perimeter of Circle : "+perimeter);
     }
     catch(Exception e){
       System.out.println("Error : "+e);
     }       
 }
}

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