Java Collection Add addAllIfSet(Collection target, Collection c)

Description

Adds all of the elements in the specified collection to the target collection if a collection is specified.

License

Open Source License

Parameter

Parameter	Description
E	a parameter
target	a parameter
c	collection containing elements to be added to this collection, may be null

Return

true if this collection changed as a result of the call

Declaration

public static <E> boolean addAllIfSet(Collection<E> target, Collection<? extends E> c) 

Method Source Code

//package com.java2s;
/*//from  w w w  . j a  v a  2 s  .c  om
 * JBoss, Home of Professional Open Source.
 * Copyright 2008, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This 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 software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

import java.util.Collection;

public class Main {
    /**
     * Adds all of the elements in the specified collection to the target collection if
     * a collection is specified.
     * 
     * @param <E>
     * @param target
     * @param c collection containing elements to be added to this collection, may be null
     * @return <tt>true</tt> if this collection changed as a result of the call
     */
    public static <E> boolean addAllIfSet(Collection<E> target, Collection<? extends E> c) {
        if (c == null)
            return false;
        return target.addAll(c);
    }
}

Related

1. addAll(T coll, Collection other)
2. addAll(T[] lhs, Collection rhs)
3. addAllFirst(Collection col, Deque deque)
4. addAllIfNotNull(final Collection collection, final Collection c)
5. addAllIfNotNull(final Collection collection, final Collection values)
6. addAllIgnoreNull(Collection c, T... elements)
7. addAllIgnoreNull(final Collection target, final Collection source)
8. addAllNotNull(final Collection c, final E... elements)
9. addAllOrSame(Collection collection, Collection newElements)