NotADirectoryException?

Question

I've written a method in a class that is to create a file list of all the files in a given directory. Works fine.
Now I wanted to implement error handling. The user might enter a directory that does not exist or one that is really a file and not a directory.
For the first case, I used
    File f = new File(folder);
    if (!f.exists())
      throw new FileNotFoundException("Ordner "+folder+" existiert nicht.");
    }But what do I do about the second case? I have looked at the different IOExceptions, but there seems to be none that is to be thrown when a File is not a directory.
    if (! f.isDirectory())
      throw new XyzException(folder+" ist kein Verzeichnis.");
    }What should I put in place of Xyz ?
I could of course simply use throw new IOException(folder+" ist kein Verzeichnis."), but that is not very good, I think. A more specific Exception is better, or is it not?
Can anyone help me?
Monika.

Answer 1

How about creating a new exception that extends
IOException.
public class DirectoryNotFoundException extends
IOException {
public DirectoryNotFoundException () {
super();
public DirectoryNotFoundException (String message)
super(message);
}Then change your code to...
throw new DirectoryNotFoundException(folder+" ist kein
Verzeichnis.");Thanks, works just fine :-)
In the JDC newsletter about exceptions, it said it's not good to create one's own exceptions, but I think it's the best solution here.
Monika.