Write the Java code for the calculareDiameter method.

* Program to find diameter, circumference and area of circle.

*/

import java.util.Scanner;

public class Circle {

   public static void main(String[] args) {

       // Declare constant for PI

       final double PI = 3.141592653;

       Scanner in = new Scanner(System.in);

       /* Input radius of circle from user. */

       System.out.println("Please enter radius of the circle : ");

       int r = in.nextInt();

       /* Calculate diameter, circumference and area. */

       int d = 2 * r;

       double circumference = 2 * PI * r;

       double area = PI * r * r;

       /* Print diameter, circumference and area of circle. */

       System.out.println("Diameter of circle is : " + d);

       System.out.println("Circumference of circle is : " + circumference);

       System.out.println("Area of circle is : " + area);

   }

}