Here you can find the source of isNotEmpty(List extends CharSequence> input)
public static boolean isNotEmpty(List<? extends CharSequence> input)
//package com.java2s; /* ======================================================================== * PlantUML : a free UML diagram generator * ======================================================================== * * (C) Copyright 2009-2014, Arnaud Roques * * Project Info: http://plantuml.sourceforge.net * /* w w w . ja v a 2s . co m*/ * This file is part of PlantUML. * * PlantUML 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 * (at your option) any later version. * * PlantUML 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 this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * * Original Author: Arnaud Roques */ import java.util.Iterator; import java.util.List; public class Main { public static boolean isNotEmpty(String input) { return input != null && input.trim().length() > 0; } public static boolean isNotEmpty(List<? extends CharSequence> input) { return input != null && input.size() > 0; } public static void trim(List<String> data, boolean removeEmptyLines) { for (int i = 0; i < data.size(); i++) { final String s = data.get(i); data.set(i, s.trim()); } if (removeEmptyLines) { for (final Iterator<String> it = data.iterator(); it.hasNext();) { if (it.next().length() == 0) { it.remove(); } } } } }