Here you can find the source of combine(byte[][] arr)
public static byte[] combine(byte[][] arr)
//package com.java2s; /*//from w w w .j a va2 s . c o m * Copyright (c) 2016 Red Hat, Inc., Rob Stryker, and 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 { public static byte[] combine(byte[][] arr) { int total = 0; for (int i = 0; i < arr.length; i++) { total += arr[i].length; } byte[] ret = new byte[total]; int count = 0; for (int i = 0; i < arr.length; i++) { for (int j = 0; j < arr[i].length; j++) { ret[count++] = arr[i][j]; } } return ret; } }