Here you can find the source of bytesToHex(byte in[])
final static String bytesToHex(byte in[])
//package com.java2s; /**//from ww w. j a v a 2s.c o m * @copyright Copyright (C) 2014-2015 City of Bloomington, Indiana. All rights reserved. * @license http://www.gnu.org/copyleft/gpl.html GNU/GPL, see LICENSE.txt * @author W. Sibo <sibow@bloomington.in.gov> */ public class Main { final static String bytesToHex(byte in[]) { byte ch = 0x00; int i = 0; if (in == null || in.length <= 0) return null; String pseudo[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F" }; StringBuffer out = new StringBuffer(in.length * 2); while (i < in.length) { ch = (byte) (in[i] & 0xF0); // Strip off high nibble ch = (byte) (ch >>> 4); // shift the bits down ch = (byte) (ch & 0x0F); // must do this is high order bit is on! out.append(pseudo[(int) ch]); // convert the nibble to a String Character ch = (byte) (in[i] & 0x0F); // Strip off low nibble out.append(pseudo[(int) ch]); // convert the nibble to a String Character i++; } String rslt = new String(out); return rslt; } }