Here you can find the source of toHex(byte[] a)
public static String toHex(byte[] a)
//package com.java2s; /**//from www . j ava 2 s . com * * #%L * geoserver-sync-core * $Id:$ * $HeadURL:$ * %% * Copyright (C) 2013 Moebius Solutions Inc. * %% * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as * published by the Free Software Foundation, either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/gpl-2.0.html>. * #L% * */ public class Main { private static final char[] charMap = "0123456789abcdef".toCharArray(); public static String toHex(byte[] a) { char[] result = new char[2 * a.length]; for (int i = 0; i < a.length; i++) { int high = (0xF0 & a[i]) >> 4; int low = (0x0F & a[i]); result[2 * i] = charMap[high]; result[2 * i + 1] = charMap[low]; } return new String(result); } }