Convert BigInteger to specified radix

import java.math.BigInteger;

public class Main {
  public static void main(String[] argv) throws Exception {
    int radix = 32;
    BigInteger bi = new BigInteger("vv", radix);
    String s = bi.toString(radix);

    System.out.println(s);
  }
}

vv

import java.math.BigInteger;

public class Main {
  public static void main(String[] args) {
    BigInteger number = new BigInteger("2008");

    System.out.println("Number      = " + number);
    System.out.println("Binary      = " + number.toString(2));
    System.out.println("Octal       = " + number.toString(8));
    System.out.println("Hexadecimal = " + number.toString(16));

    number = new BigInteger("FF", 16);
    System.out.println("Number      = " + number);
    System.out.println("Number      = " + number.toString(16));
  }
}

Number      = 2008
Binary      = 11111011000
Octal       = 3730
Hexadecimal = 7d8
Number      = 255
Number      = ff