Here you can find the source of toHexCharArray(byte[] input)
public static char[] toHexCharArray(byte[] input)
//package com.java2s; /**/*from w w w .j a v a 2s .co m*/ * Copyright 2013-2015 Pierre Merienne * * 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 char[] toHexCharArray(byte[] input) { int m = input.length; int n = 2 * m; int l = 0; char[] output = new char[n]; for (int k = 0; k < m; k++) { byte v = input[k]; int i = (v >> 4) & 0xf; output[l++] = (char) (i >= 10 ? ('a' + i - 10) : ('0' + i)); i = v & 0xf; output[l++] = (char) (i >= 10 ? ('a' + i - 10) : ('0' + i)); } return output; } }