Here you can find the source of orderedEqual(Collection
public static final <T> boolean orderedEqual(Collection<T> c1, Collection<T> c2)
//package com.java2s; /*/*from w ww.ja v a2 s. c o m*/ Copyright (c) 2009-2011 Olivier Chafik, All Rights Reserved This file is part of JNAerator (http://jnaerator.googlecode.com/). JNAerator is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. JNAerator 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 General Public License for more details. You should have received a copy of the GNU General Public License along with JNAerator. If not, see <http://www.gnu.org/licenses/>. */ import java.util.Collection; import java.util.Iterator; public class Main { public static final <T> boolean orderedEqual(Collection<T> c1, Collection<T> c2) { if (c1.size() != c2.size()) return false; Iterator<T> i1 = c1.iterator(), i2 = c2.iterator(); while (i1.hasNext() && i2.hasNext()) { T t1 = i1.next(), t2 = i2.next(); if ((t1 == null) != (t2 == null)) return false; if (t1 != null) { if (!(t1.equals(t2) && t2.equals(t1))) return false; } } return (i1.hasNext() == i2.hasNext()); } }