Java Collection Add addAll(Collection dest, Collection orig)

Description

Null safe method for adding all the elements in "orig" to "dest"

License

Educational Community License

Declaration

public static final <T> void addAll(Collection<T> dest,
        Collection<T> orig) 

Method Source Code

//package com.java2s;
/**//from   ww w.jav  a  2s .c  o  m
 * Copyright 2011-2013 The Kuali Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.opensource.org/licenses/ecl2.php
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.Collection;

public class Main {
    /**
     * Null safe method for adding all the elements in "orig" to "dest"
     */
    public static final <T> void addAll(Collection<T> dest,
            Collection<T> orig) {
        if (!isEmpty(orig)) {
            dest.addAll(orig);
        }
    }

    /**
     * True if the collection is null or has no elements, false otherwise
     */
    public static final boolean isEmpty(Collection<?> c) {
        return c == null || c.size() == 0;
    }
}

Related

1. addAll(Collection collection, T... newElements)
2. addAll(Collection collection, T[] array)
3. addAll(Collection collection, T[] array)
4. addAll(Collection collection, T[] items)
5. addAll(Collection dest, Collection src, Class type)
6. addAll(Collection dest, T... elements)
7. addAll(Collection intoCollection, Collection fromCollection)
8. addAll(Collection left, Collection right)
9. addAll(Collection t1, Iterable t2)