Java Collection Copy copy(final Collection collection)

Description

Returns copy of the specified list.

License

Open Source License

Parameter

Parameter	Description
collection	list to copy
T	list type

Return

copy of the specified list

Declaration

public static <T> ArrayList<T> copy(final Collection<T> collection) 

Method Source Code

//package com.java2s;
/*//from   ww  w .j  a  v  a 2 s .c o m
 * This file is part of WebLookAndFeel library.
 *
 * WebLookAndFeel library 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.
 *
 * WebLookAndFeel library 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 WebLookAndFeel library.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.*;

public class Main {
    /**
     * Returns copy of the specified list.
     * Note that this method will copy same list values into the new list.
     *
     * @param collection list to copy
     * @param <T>        list type
     * @return copy of the specified list
     */
    public static <T> ArrayList<T> copy(final Collection<T> collection) {
        if (collection == null) {
            return null;
        }
        return new ArrayList<T>(collection);
    }

    /**
     * Returns data converted into list.
     *
     * @param data data
     * @param <T>  data type
     * @return data list
     */
    public static <T> ArrayList<T> copy(final T... data) {
        final ArrayList<T> list = new ArrayList<T>(data.length);
        Collections.addAll(list, data);
        return list;
    }

    /**
     * Adds all objects into the specified list.
     *
     * @param collection list to fill
     * @param objects    objects
     * @param <T>        objects type
     * @return true if list changed as the result of this operation, false otherwise
     */
    public static <T> boolean addAll(final Collection<T> collection, final T... objects) {
        boolean result = false;
        for (final T object : objects) {
            if (!collection.contains(object)) {
                result |= collection.add(object);
            }
        }
        return result;
    }

    /**
     * Adds all objects into the specified list.
     *
     * @param collection list to fill
     * @param objects    objects
     * @param <T>        objects type
     * @return true if list changed as the result of this operation, false otherwise
     */
    public static <T> boolean addAll(final Collection<T> collection, final Collection<T> objects) {
        boolean result = false;
        for (final T object : objects) {
            if (!collection.contains(object)) {
                result |= collection.add(object);
            }
        }
        return result;
    }
}

Related

1. copy(Collection args)
2. copy(Collection collection)
3. copy(final Collection in)
4. copy(final Collection collection)
5. copy2Collection(Object[] strs)
6. copyColl(Collection out, Iterable set)
7. copyIntoCollectionFrom(Collection collection, Iterable iterable)