Here you can find the source of toHexString(byte b)
public static String toHexString(byte b)
//package com.java2s; /**//from w ww . j a v a2 s . com * The Accord Project, http://accordproject.org * Copyright (C) 2005-2013 Rafael Marins, http://rafaelmarins.com * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { public static String toHexString(byte b) { String hex = Integer.toHexString((int) b & 0xff); if (hex.length() == 1) { return ('0' + hex); } else { return hex; } } public static String toHexString(byte[] barray) { return toHexString(barray, barray.length); } public static String toHexString(byte[] barray, int max) { max = Math.min(max, barray.length); StringBuffer hexArray = new StringBuffer("Hex["); for (int i = 1; i <= max; i++) { byte b = barray[i - 1]; hexArray.append(toHexString(b)); if (i < max) { if (i % 5 == 0) hexArray.append(" "); else { hexArray.append(" "); } } } hexArray.append("]"); return hexArray.toString(); } }