Here you can find the source of firstElementOf(final Collection extends T> items)
public static <T> T firstElementOf(final Collection<? extends T> items)
//package com.java2s; /*// ww w . j a va 2 s . c o m * Copyright 2012 Daniel Bechler * * 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.*; public class Main { public static <T> T firstElementOf(final Collection<? extends T> items) { if (items != null && !items.isEmpty()) { return items.iterator().next(); } return null; } public static boolean isEmpty(final Collection<?> c) { return c == null || c.isEmpty(); } }