Java tutorial
//package com.java2s; /* * This file is part of Infinitest. * * Copyright (C) 2010 * "Ben Rady" <benrady@gmail.com>, * "Rod Coffin" <rfciii@gmail.com>, * "Ryan Breidenbach" <ryan.breidenbach@gmail.com>, et al. * * Infinitest is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Infinitest is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Infinitest. If not, see <http://www.gnu.org/licenses/>. */ import java.util.*; public class Main { public static <T> T first(Collection<T> list) { Iterator<T> iterator = list.iterator(); if (iterator.hasNext()) { return iterator.next(); } return null; } }