Here you can find the source of mergeLists(List
public static <T> void mergeLists(List<T> dest, List<T> inserts)
//package com.java2s; /******************************************************************************* * Copyright (c) 2014 Karlsruhe Institute of Technology, Germany * Technical University Darmstadt, Germany * Chalmers University of Technology, Sweden * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors://from www . j ava2s. c o m * Technical University Darmstadt - initial API and implementation and/or initial documentation *******************************************************************************/ import java.util.List; public class Main { public static <T> void mergeLists(List<T> dest, List<T> inserts) { // TODO: Move to CollectionUtil for (T t : inserts) { if (!dest.contains(t)) { dest.add(t); } } } }