Here you can find the source of byteToHex(final byte b, StringBuilder buffer)
static void byteToHex(final byte b, StringBuilder buffer)
//package com.java2s; /**/* www .j a v a 2 s. com*/ * Copyright (c) 2013-2014 Santiago M. Mola <santi@mola.io> * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ public class Main { private static final char[] _hex = "0123456789ABCDEF".toCharArray(); static void byteToHex(final byte b, StringBuilder buffer) { int i = b & 0xFF; buffer.append(_hex[i >>> 4]); buffer.append(_hex[i & 0x0F]); } }