Here you can find the source of getFirst(Iterable
public static <T> T getFirst(Iterable<T> iterable, T defaultValue)
//package com.java2s; /*//from ww w .jav a2 s. co m * Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved. * * 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.Iterator; public class Main { /** * @return First element or defaultValue if iterable is empty */ public static <T> T getFirst(Iterable<T> iterable, T defaultValue) { Iterator<T> iterator = iterable.iterator(); return iterator.hasNext() ? iterator.next() : defaultValue; } }