Here you can find the source of addTo(final Iterator
public static <T, C extends Collection<? super T>> C addTo(final Iterator<T> iter, final C c)
//package com.java2s; /*/*from w w w . j a v a 2 s.com*/ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved. * * The contents of this file are subject to the terms of the GNU General Public License Version 3 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific * language governing permissions and limitations under the License. * * When distributing the software, include this License Header Notice in each file. */ import java.util.Collection; import java.util.Iterator; public class Main { public static <T, C extends Collection<? super T>> C addTo(final Iterator<T> iter, final C c) { while (iter.hasNext()) c.add(iter.next()); return c; } }