Get File Name Suffix : File Utilities « File « Java Tutorial

 * Copyright (C) 2001-2003 Colin Bell
 * This library 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 library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

import java.text.NumberFormat;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

 * General purpose utilities functions.
 * @author <A HREF="">Colin Bell</A>
public class Utilities

   * Return the suffix of the passed file name.
   * @param  fileName  File name to retrieve suffix for.
   * @return Suffix for <TT>fileName</TT> or an empty string
   *       if unable to get the suffix.
   * @throws IllegalArgumentException  if <TT>null</TT> file name passed.
  public static String getFileNameSuffix(String fileName)
     if (fileName == null)
        throw new IllegalArgumentException("file name == null");
     int pos = fileName.lastIndexOf('.');
     if (pos > 0 && pos < fileName.length() - 1)
        return fileName.substring(pos + 1);
     return "";


11.55.File Utilities
11.55.1.Ensuring a File Exists
11.55.2.Avoiding Overwriting a File
11.55.3.Copying Files using FileChannel
11.55.4.Format Size
11.55.5.Move File
11.55.6.Compare binary files
11.55.7.Get file date and time
11.55.8.Rename To Temporary Name
11.55.9.Return readable file size with selected value measure
11.55.10.Utility class for synchronizing files/directories
11.55.11.Count files in a directory (including files in all subdirectories)
11.55.12.Extract File Extension
11.55.13.Strip File Extension
11.55.14.Remove File Name Suffix
11.55.15.Get File Name Suffix