Here you can find the source of concat(byte[]... arrays)
public static byte[] concat(byte[]... arrays)
//package com.java2s; /*-------------------------------------------------------------------------+ | | | Copyright 2005-2011 the ConQAT Project | | | | 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. | +-------------------------------------------------------------------------*/ import java.util.Arrays; public class Main { /** Returns the concatenation of the given arrays. */ public static byte[] concat(byte[]... arrays) { return concat(Arrays.asList(arrays)); }// ww w. java2s . c o m /** Returns the concatenation of the given arrays. */ public static byte[] concat(Iterable<byte[]> arrays) { int length = 0; for (byte[] array : arrays) { length += array.length; } byte[] result = new byte[length]; int start = 0; for (byte[] array : arrays) { System.arraycopy(array, 0, result, start, array.length); start += array.length; } return result; } }