program to find area & circumference of a circle

Question :Write a program to find area and circumference of a circle
Question From :
 Fathima Neethu
Malappuram 
fathimaneethu88@gmail.com 
Answer:

import java.io.*;
import java.lang.*;
import java.io.DataInputStream;
class Area
{
    int r;
void calculate()
{

    try
    {
        DataInputStream in=new DataInputStream(System.in);
        r=Integer.parseInt(in.readLine());
}
catch(Exception e)
{
}
    System.out.println("Area of the circle = " + 3.14*r*r);
    System.out.println("Circumference of the circle = " + 2*3.14*r);
}   
}
class AreaDemo
{
    public static void main(String args[])
    {
        Area area=new Area();
        area.calculate();
        }
    }


O/P