Numerical Systems

package MOPHomeworks;

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

public class ConvertingToRandomSystem {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        System.out.print("Enter number: ");
        int number = Integer.parseInt(reader.readLine());
        System.out.print("Enter number system: ");
        int numberSystem = Integer.parseInt(reader.readLine());
        System.out.println(String.format("The number %d int %d number system is: %s",number,numberSystem,convertNumber(number,numberSystem)));
    }

    static String convertNumber(int number, int numberSystem){
        String result = "";

        while (number >= numberSystem){
            result = result + (number % numberSystem + "");
            number /= numberSystem;
        }

        result +="" + number;

        return new StringBuilder(result).reverse().toString();
    }
}