Here you can find the source of contentEquals(Collection
public static <T> boolean contentEquals(Collection<T> l1, Collection<T> l2)
//package com.java2s; /******************************************************************************* * Copyright 2009, 2010 Lars Grammel /*from ww w.j av a2 s .com*/ * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *******************************************************************************/ import java.util.ArrayList; import java.util.Collection; import java.util.List; public class Main { public static <T> boolean contentEquals(Collection<T> l1, Collection<T> l2) { return l1.containsAll(l2) && l1.size() == l2.size(); } public static <T> boolean contentEquals(Iterable<T> i1, Iterable<T> i2) { return contentEquals(toList(i1), toList(i2)); } public static <T> List<T> toList(Iterable<T> iterable) { List<T> result = new ArrayList<T>(); for (T t : iterable) { result.add(t); } return result; } public static <T> List<T> toList(T... ts) { List<T> list = new ArrayList<T>(); for (T t : ts) { list.add(t); } return list; } }