JAVA help

Hey, the &d is not working in this program.... anyone know why?   I am new to java.

import java.util.Scanner;


public class Circle {
   

    public static void main( String args[] )
    {

    Scanner input = new Scanner( System.in );

    double radius;
    double diameter;
    double circum;
    double area;
   
    //Get Radius
    System.out.println( "Enter Radius:" );
    radius = input.nextInt();

    //Figure Values
    diameter = radius * 2;
    circum = 3.14159 * diameter;
    area = 3.14159 * radius * radius;

    System.out.printf( "Diameter is %d\n: " , diameter );
    }
}

in Java you don't use printf. ever. it's System.out.print or System.out.println

Also, you just put in the damn variable. System.out.print("The Diameter is " + diameter);

There, I killed the joke