Here you can find the source of concat(T[] head, T... tail)
| Parameter | Description |
|---|---|
| T | the type of elements in the source arrays |
| head | the prefix of the result array |
| tail | the elements to be concatenated to head |
@SuppressWarnings("unchecked") public static <T> T[] concat(T[] head, T... tail)
//package com.java2s; /*//from w w w.ja va 2s .c om * Copyright (c) 2017, APT Group, School of Computer Science, * The University of Manchester. All rights reserved. * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */ import java.util.*; public class Main { /** * Concatenates two arrays. * * @param <T> the type of elements in the source arrays * @param head the prefix of the result array * @param tail the elements to be concatenated to {@code head} * @return the result of concatenating {@code tail} to the end of {@code head} */ @SuppressWarnings("unchecked") public static <T> T[] concat(T[] head, T... tail) { T[] result = Arrays.copyOf(head, head.length + tail.length); System.arraycopy(tail, 0, result, head.length, tail.length); return result; } }