Java tutorial
//package com.java2s; /* * Copyright 2016 The Coinblesk team and the CSG Group at University of Zurich * * 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 byte[] concatBytes(byte[]... byteArrays) { int totalLength = 0; for (byte[] byteArray : byteArrays) { if (byteArray != null) { totalLength += byteArray.length; } } final byte[] concatBuffer = new byte[totalLength]; int copyCounter = 0; for (byte[] byteArray : byteArrays) { if (byteArray != null) { System.arraycopy(byteArray, 0, concatBuffer, copyCounter, byteArray.length); copyCounter += byteArray.length; } } return concatBuffer; } }