Java File Extension Name Get extractExtension(String fileName)

Description

Extract the file-extension

License

Open Source License

Parameter

Parameter	Description
fileName	the file name

Return

empty string (if no extension) or the files extension

Declaration

public static String extractExtension(String fileName) 

Method Source Code

//package com.java2s;
/*//w  w  w  . j a va 2  s.  c o  m
 * JBoss, Home of Professional Open Source.
 * Copyright 2007, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This 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 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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 this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 * 
 */

public class Main {
    /**
     * Extract the file-extension
     * @param fileName the file name
     * @return empty string (if no extension) or the files extension
     */
    public static String extractExtension(String fileName) {
        String extension = null;
        if (fileName == null) {
            extension = "";
        } else {
            int place = fileName.lastIndexOf('.');
            if (place >= 0) {
                extension = fileName.substring(place + 1);
            } else {
                extension = "";
            }
        }
        return extension;
    }
}

Related

1. extractExtension(final String fileName)
2. extractExtension(String name)
3. extractExtension(String s)
4. extractExtension(String strFilename)
5. extractExtension(String url)