Java Collection Remove remove(final int index, final Collection collection)

Description

remove

License

Open Source License

Declaration

public static <T extends Object> T remove(final int index, final Collection<T> collection) 

Method Source Code

//package com.java2s;
/*/*from  w w  w  .ja v a  2 s. com*/
 * Copyright (C) 2013 Marcius da Silva da Fonseca.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA
 */

import java.util.Collection;

import java.util.Iterator;

import java.util.Map;

public class Main {
    public static <T extends Object> T remove(final int index, final Collection<T> collection) {
        if (!isEmptyOrNull(collection)) {
            int i = 0;
            for (Iterator<T> it = collection.iterator(); it.hasNext();) {
                final T removed = it.next();
                if (i == index) {
                    it.remove();
                    return removed;
                }
                i++;
            }
        }
        return null;
    }

    /**
     * Tells if a given collection is null or empty.
     *
     * @param collection The collection to be evaluated.
     * @return {@code true} if the given collection is null or empty.
     */
    public static boolean isEmptyOrNull(final Collection<?> collection) {
        return collection == null || collection.isEmpty();
    }

    /**
     * Tells if a given map is null or empty.
     *
     * @param map The map to be evaluated.
     * @return {@code true} if the given map is null or empty.
     */
    public static boolean isEmptyOrNull(final Map<?, ?> map) {
        return map == null || map.isEmpty();
    }

    /**
     * Asks an iterator if there is next value.
     *
     * @param it The iterator to analise.
     * @return true if the given iterator is not null and has next element. false otherwise.
     */
    public static boolean hasNext(final Iterator<?> it) {
        return it != null && it.hasNext();
    }
}

Related

1. remove(Collection p_collection, int p_index, int p_numberOfObjects)
2. remove(Collection col, T value)
3. remove(Collection collection, final int count)
4. remove(Collection collection, T... items)
5. remove(final Collection c, final Object elem)
6. removeAll(Collection collection, Collection remove)
7. removeAll(Collection source, Set remove)
8. removeAll(Collection c, Iterable elts)
9. removeAll(Collection c, Object e)