Java tutorial
//package com.java2s; /* * This file is part of dzlib, licensed under the MIT License (MIT). * * Copyright (c) 2014 Oliver Stanley <http://ollie.pw> * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ import java.util.ArrayList; import java.util.Collection; import java.util.List; public class Main { /** * Removes all duplicates from the given {@link Collection}. What is / isn't * a duplicate is determined by the method used by a {@link ArrayList}'s * {@link List#contains(Object)} implementation. * * @param collection the {@link Collection} to remove duplicates from * @param <T> the type of the input {@link Collection} * @return the given {@link Collection}, without duplicates */ public static <T extends Collection<?>> T trimDuplicates(T collection) { List<Object> noDuplicates = new ArrayList<>(collection.size()); collection.forEach((object) -> { if (noDuplicates.contains(object)) { collection.remove(object); } else { noDuplicates.add(object); } }); return collection; } }