Java tutorial
//package com.java2s; /* * XAdES4j - A Java library for generation and verification of XAdES signatures. * Copyright (C) 2010 Luis Goncalves. * * XAdES4j is free software; you can redistribute it and/or modify it under * the terms of the GNU Lesser General Public License as published by the Free * Software Foundation; either version 3 of the License, or any later version. * * XAdES4j 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 Lesser General Public License for more * details. * * You should have received a copy of the GNU Lesser General Public License along * with XAdES4j. If not, see <http://www.gnu.org/licenses/>. */ import java.util.Collection; public class Main { /** * Indicates whether a collection is {@code null} or empty. * @param c the collection to be tested * @return {@code true} if the collection is {@code null} or empty */ public static <T> boolean nullOrEmpty(Collection<T> c) { return null == c || c.isEmpty(); } }