Here you can find the source of dump(Iterator
public static <T> Iterator<T> dump(Iterator<T> it)
//package com.java2s; /*//from w w w. ja va2s . co m * Copyright (c) 2015 Eike Stepper (Berlin, Germany) and others. * 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: * Eike Stepper - initial API and implementation */ import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class Main { public static <T> Iterator<T> dump(Iterator<T> it) { List<T> list = new ArrayList<T>(); while (it.hasNext()) { list.add(it.next()); } System.out.println(list); return list.iterator(); } }