Here you can find the source of merge(List
public static <O> List<O> merge(List<O> l1, List<O> l2)
//package com.java2s; /* ======================================================================== * PlantUML : a free UML diagram generator * ======================================================================== * * (C) Copyright 2009-2014, Arnaud Roques * * Project Info: http://plantuml.sourceforge.net * // w w w . ja v a2 s . c om * This file is part of PlantUML. * * PlantUML is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * PlantUML 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 Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * * Original Author: Arnaud Roques */ import java.util.ArrayList; import java.util.Collections; import java.util.List; public class Main { public static <O> List<O> merge(List<O> l1, List<O> l2) { final List<O> result = new ArrayList<O>(l1); result.addAll(l2); return Collections.unmodifiableList(result); } }