Java tutorial
//package com.java2s; /* * Xapp (pronounced Zap!), A automatic gui tool for Java. * Copyright (C) 2009 David Webber. All Rights Reserved. * * The contents of this file may be used under the terms of the GNU Lesser * General Public License Version 2.1 or later. * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. */ import java.util.*; public class Main { public static <T> T zeroOrOne(List<? extends T> items) { return items == null || items.isEmpty() ? null : items.get(0); } }