Java tutorial
//package com.java2s; /* * This file is part of Butter. * * Butter 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. * * Butter 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 Butter. If not, see <http://www.gnu.org/licenses/>. */ public class Main { /** * Get the extension of the file * * @param fileName Name (and location) of the file * @return Extension */ public static String getFileExtension(String fileName) { String extension = ""; int i = fileName.lastIndexOf('.'); int p = Math.max(fileName.lastIndexOf('/'), fileName.lastIndexOf('\\')); if (i > p) { extension = fileName.substring(i + 1); } return extension; } }