Menghitung Luas dan Keliling Lingkaran Java

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner userInput = new Scanner(System.in);

        double phi = 3.14d;
        double r, luas, keliling;

        System.out.println("\n\t Hitung Luas & Keliling Lingkaran \n");

        System.out.print(" Inputkan Jari-jari Lingkaran : ");
        r = userInput.nextDouble();

        luas = phi * r * r;
        System.out.println("\n Luas Lingkaran     : " + luas);

        keliling = 2 * phi * r;
        System.out.println("\n Keliling Lingkaran : " + keliling);

        System.out.println();
    }
}