Java tutorial
package com.github.albfernandez.joinpdf; /* (C) Copyright 2014-2015 Alberto Fernndez <infjaf@gmail.com> This file is part of joinpdf. Foobar 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. Foobar 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 Foobar. If not, see <http://www.gnu.org/licenses/>. */ import java.io.File; import java.io.FileFilter; import org.apache.commons.lang3.StringUtils; public class JoinPdfFileFilter implements FileFilter { public JoinPdfFileFilter() { super(); } public final boolean accept(final File pathname) { if (pathname == null) { return false; } String fileName = StringUtils.lowerCase(pathname.getName(), JoinPdf.LOCALE_ES); return fileName.endsWith("pdf") || fileName.endsWith("png") || fileName.endsWith("jpg") || fileName.endsWith("jpeg") || fileName.endsWith("tiff") || fileName.endsWith("tif"); } }