Here you can find the source of first(Collection
Parameter | Description |
---|---|
collection | The collection. |
T | The objects stored in the collection. |
public static <T> T first(Collection<T> collection)
//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(); } }