Here you can find the source of concatArrays(T[] first, T[] second)
Parameter | Description |
---|---|
T | The type of both arrays. |
first | The first array. |
second | The second array. |
\forall i : 0 <= i < first.length : \result[i] == first[i]and analoguous
\forall i : first.length <= i < \result.length : \result[i] == second[i - first.length].
public static <T> T[] concatArrays(T[] first, T[] second)
//package com.java2s; /*//from w w w. j a v a2 s. c o m * Copyright 2013 Thom Castermans thom.castermans@gmail.com * Copyright 2013 Willem Sonke willemsonke@planet.nl * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License or (at your option) version 3 or any later version * accepted by the membership of KDE e.V. (or its successor approved * by the membership of KDE e.V.), which shall act as a proxy * defined in Section 14 of version 3 of the license. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.util.Arrays; public class Main { /** * Concatenate two arrays and return the result. * This method is copied from <a href="http://stackoverflow.com/questions/80476/how-to-concatenate-two-arrays-in-java"> * StackOverflow</a>, answer of <i>Joachim Sauer</i> and then slightly adjusted. * * @param <T> The type of both arrays. * @param first The first array. * @param second The second array. * @return An array consisting of the concatenation of first and second. * That is, <pre>\forall i : 0 <= i < first.length : \result[i] == first[i]</pre> * and analoguous <pre>\forall i : first.length <= i < \result.length : \result[i] == second[i - first.length]</pre>.<br> * If one the two is {@code null}, the other array will be returned. * If both are {@code null}, then {@code null} will be returned. */ public static <T> T[] concatArrays(T[] first, T[] second) { if (first == null && second == null) return null; if (first == null) return second; if (second == null) return first; T[] result = Arrays.copyOf(first, first.length + second.length); System.arraycopy(second, 0, result, first.length, second.length); return result; } }