Here you can find the source of toHex(byte b)
private static String toHex(byte b)
//package com.java2s; /*/*from w w w . j a v a 2 s . c om*/ * Copyright ? 2008 Red Hat Middleware, LLC. or third-party contributors as indicated * by the @author tags or express copyright attribution statements applied by the * authors. All third-party contributions are distributed under license by Red Hat * Middleware LLC. * * This copyrighted material is made available to anyone wishing to use, modify, copy, * or redistribute it subject to the terms and conditions of the GNU Lesser General * Public License, v. 2.1. This program is distributed in the hope that it will be * useful, but WITHOUT A WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for * more details. You should have received a copy of the GNU Lesser General Public License, * v.2.1 along with this distribution; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ public class Main { private static final char[] HEX_VALUES = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; private static String toHex(byte b) { char[] characters = new char[2]; characters[0] = HEX_VALUES[(b >>> 4) & 0x0F]; characters[1] = HEX_VALUES[b & 0x0F]; return new String(characters); } }