Here you can find the source of addToCollection(Collection
private static <T> void addToCollection(Collection<T> theCollection, T... objects)
//package com.java2s; /*// w ww.ja va 2 s . co m Milyn - Copyright (C) 2006 - 2010 This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License (version 2.1) as published by the Free Software Foundation. This library 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 Lesser General Public License for more details: http://www.gnu.org/licenses/lgpl.txt */ import java.util.*; public class Main { private static <T> void addToCollection(Collection<T> theCollection, T... objects) { for (T object : objects) { theCollection.add(object); } } }