Java Collection First first(Collection collection)

Here you can find the source of 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)