Here you can find the source of equalContent(Collection
public static <T> boolean equalContent(Collection<T> col1, Collection<T> col2)
//package com.java2s; /*// w w w .j a v a2 s. c o m * This file is part of Gradoop. * * Gradoop 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. * * Gradoop 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 Gradoop. If not, see <http://www.gnu.org/licenses/>. */ import java.util.Collection; public class Main { public static <T> boolean equalContent(Collection<T> col1, Collection<T> col2) { boolean equal = col1.size() == col2.size(); if (equal) { for (T val : col1) { equal = col2.contains(val); if (!equal) { break; } } if (equal) { for (T val : col2) { equal = col1.contains(val); if (!equal) { break; } } } } return equal; } }