Java Collection First first(Collection collection)

Description

Return the first element of the collection.

License

Apache License

Parameter

Parameter	Description
collection	The collection.
T	The objects stored in the collection.

Return

The first element of the collection or null if the collection is empty.

Declaration

public static <T> T first(Collection<T> collection) 

Method Source Code

//package com.java2s;
/*/*ww w . j a va 2 s.c  om*/
 * Copyright JTheque (Baptiste Wicht)
 *
 * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
 *
 * 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 {
    /**
     * Return the first element of the collection.
     *
     * @param collection The collection.
     * @param <T>        The objects stored in the collection.
     *
     * @return The first element of the collection or null if the collection is empty.
     */
    public static <T> T first(Collection<T> collection) {
        if (collection.isEmpty()) {
            return null;
        }

        return collection.iterator().next();
    }
}

Related

1. first(Collection collection)
2. first(Collection self)
3. first(Collection c)
4. first(Collection c)
5. first(Collection collection)
6. firstElement(Collection in)
7. firstElement(Collection c)
8. firstElementOf(final Collection collection)
9. firstElementOf(final Collection items)