File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
http://aspose.com/file-tools
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file format

 
raaga sree
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if i select a particular file extension,the files of that format has to be listed .is thare any algorithm for that..
 
Campbell Ritchie
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Welcome to JavaRanch

There are ways of doing it with JFileChooser; you can add a filter. There is a section in the Java Tutorials about that.
There are methods in the File class; you can use the isDirectory method to find whether an object represents a directory, then the list method, then on each of the Strings the lastIndexOf or endsWith methods.

Other people will doubtless think of other ways to do it.
 
It is sorta covered in the JavaRanch Style Guide.
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