Here you can find the source of add(final List
public static <T> void add(final List<T> toList, final List<T> fromList)
//package com.java2s; /******************************************************************************* * Copyright (c) 2005-2011 eBay Inc.//from w w w. jav a2 s. c o m * 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 * *******************************************************************************/ import java.util.List; public class Main { public static <T> void add(final List<T> toList, final List<T> fromList) { if (toList == null || fromList == null) { return; } for (T t : fromList) { if (!toList.contains(t)) { toList.add(t); } } } }