Removes all duplicates from the given Collection . - Java java.util

Java examples for java.util:Collection Operation

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Description

Removes all duplicates from the given Collection .

Demo Code

/*//from w  w w . ja  v a  2 s .com
     * 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.
     */
    //package com.java2s;
    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;
}
    }

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