Here you can find the source of toHexString(byte[] b)
static public String toHexString(byte[] b)
//package com.java2s; /*//from w w w .j av a 2 s . com * Vige, Home of Professional Open Source * Copyright 2010, Vige, and individual contributors * by the @authors tag. See the copyright.txt in the distribution for a * full listing of individual contributors. * * 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 { static final char[] hexChar = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; static public String toHexString(byte[] b) { StringBuffer sb = new StringBuffer(b.length * 2); for (int i = 0; i < b.length; i++) { // look up high nibble char sb.append(hexChar[(b[i] & 0xf0) >>> 4]); // look up low nibble char sb.append(hexChar[b[i] & 0x0f]); } return setBinaryLength(sb.toString()); } static public String setBinaryLength(String result) { while (true) { if (result.endsWith("0")) result = result.substring(0, result.lastIndexOf("0")); else break; } if (result.length() % 2 != 0) result = result + "0"; return result; } }