Java tutorial
//package com.java2s; public class Main { public static String hexEncode(byte[] aInput) { StringBuilder result = new StringBuilder(); char[] digits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; for (int idx = 0; idx < aInput.length; ++idx) { byte b = aInput[idx]; result.append(digits[(b & 0xf0) >> 4]); result.append(digits[b & 0x0f]); } return result.toString(); } }