java - Find out whether a file have extension or not -

I have a file, sometimes with extensions or with out extensions. Using Java to know if there is a specific file extension

Commons-A method in IO A file extension with a path or file name that will be found: For example

  string result = file name availability. Extension ("foo.txt");   
 returns the result  txt . If there is no extension in the file, you will get an empty string back. A simple  isExty  check on the string will tell you whether there is any extension. From documentation:  
 
 When you deal with file names, you can influence issues with Windows based development machine when going to a Unix-based production machine. The purpose of this class [commons-io] is to help them avoid those problems.  
 This method gives the literal portion of the filename after the last point. There should be no directory separator after dot.