Menghitung Nilai Faktorial Bilangan dengan Java

Faktorial

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * @Developer    : Erik Gunawan
 * @Nickname     : EXz
 * @Phone        : 0896 5332 0577
 * @EMail        : admin@erikgunawan.com
 * @Gmail        : erik.gunawan44@gmail.com
 * @Website      : www.erikgunawan.com
 * @Facebook     : facebook.com/revolutionist.exz
 * @Twitter      : twitter.com/_EXz
 */

public class Faktorial {
    private static BufferedReader br = null;
    
    public static void main(String[] args) {
        System.out.println("===========================================");
        System.out.println("Program Menghitung Nilai Faktorial Bilangan");
        System.out.println("===========================================");
        System.out.println("");
        
        boolean cek = true;
        while (cek) { 
            br = new BufferedReader(new InputStreamReader(System.in));
            try {
                System.out.print("Masukkan bilangan asli : ");
                int bil = Integer.parseInt(br.readLine());

                System.out.println("");

                String output = "Nilai faktorial dari " + bil + "! adalah ";
                if (bil==0)
                    System.out.println(output + "1");
                else if (bil>0) {
                    int hasil = 1;
                    for (int i=bil; i>0; i--) {
                        hasil *= i;
                    }
                    System.out.println(output + hasil);
                }
                else
                    System.out.println("Nilai yang Anda masukkan bukan bilangan asli!");
                
                System.out.print("Ingin coba lagi (Y/N) ? ");

                String coba = br.readLine();
                if (coba.equalsIgnoreCase("N"))
                    cek = false;
                else if (coba.equalsIgnoreCase("Y"))
                    cek = true;
                else
                    System.exit(0);
            }
            catch (IOException ioe) {
                System.out.println("Error IOException");
            }
        }
    }
}