i-Kios Pulsa

import java.util.Scanner;

public class Pulsa
{
    private enum Provider{
        Telkomsel, Indosat, Tri, Xl
    };
    private int nominalPulsa;
    private Provider provider;
    private String nomorHp;
    Scanner scan = new Scanner(System.in);

    public void beliPulsa()
    {
        System.out.println("Masukkan Provider: ");
        System.out.println("1. Telkomsel");
        System.out.println("2. Indosat");
        System.out.println("3. 3");
        System.out.println("4. XL");
        provider = kodeToProvider(scan.nextInt());

        System.out.println("Masukkan Nomor HP: ");
        nomorHp = scan.next();

        System.out.println("Masukkan Nominal Pulsa: ");
        nominalPulsa = scan.nextInt();

        printNota();
    }

    public void printNota()
    {
        System.out.println("######################################");
        System.out.println("# I-Kios");
        System.out.println("# Pulsa");
        System.out.println("# Provider: " + providerToString(provider));
        System.out.println("# Nomor: " + nomorHp);
        System.out.println("# Nominal: " + nominalPulsa);
        System.out.println("# Harga: " + (nominalPulsa + 2000));
        System.out.println("######################################");
    }

    private Provider kodeToProvider(int kode) {
        switch (kode) {
            case 1:
                return Provider.Telkomsel;
            case 2:
                return Provider.Indosat;
            case 3:
                return Provider.Tri;
            case 4:
                return Provider.Xl;
            default:
                return null;
        }
    }

    private String providerToString(Provider Provider) {
        switch (Provider) {
            case Telkomsel:
                return "Telkomsel";
            case Indosat:
                return "Indosat";
            case Tri:
                return "Tri";
            case Xl:
                return "XL";
            default:
                return null;
        }
    }

}