Here you can find the source of toHex(final String input)
public static String toHex(final String input)
//package com.java2s; /*//from ww w . j a v a 2 s.c o m * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ public class Main { private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; public static char[] toHex(final byte[] input) { int position = 0; char[] characters = new char[input.length * 2]; for (int index = 0; index < input.length; index++) { characters[position++] = HEX_DIGITS[(input[index] >> 4) & 0x0F]; characters[position++] = HEX_DIGITS[input[index] & 0x0f]; } return characters; } public static String toHex(final String input) { return new String(toHex(input.getBytes())); } }