Java File class help...

hey all,

sorry if this was asked before, I haven't seen it up before.

I have the user selecting a directory through a JFileChooser and, from this, I am displaying the list of files within that directory.

I want to filter the files of a specific type, so that erroneous files aren't processed, but when I use the method in File class,

file.listFiles(new CustomFileFilter());

it won't compile,saying it doesn't recognise the method which takes a file filter as an argument. The only way to use the fileFilter is through extending it or implementing it, and that doesn't work, which is driving me up the wall.

I just want the list of files to be of a specific type, any help would be great on this, thanks

anthonymcg

Had this working on a college project before but can't remember the exact code. Will look it up tonight and get back to ya but you might solve it in the meantime.

hussey

You need to extend FileFilter

eg.

public class ImageFilter extends FileFilter {

    //Accept all directories and all gif, jpg, tiff, or png files.
    public boolean accept(File f) {
        if (f.isDirectory()) {
            return true;
        }

        String extension = Utils.getExtension(f);
        if (extension != null) {
            if (extension.equals(Utils.tiff) ||
                extension.equals(Utils.tif) ||
                extension.equals(Utils.gif) ||
                extension.equals(Utils.jpeg) ||
                extension.equals(Utils.jpg) ||
                extension.equals(Utils.png)) {
                    return true;
            } else {
                return false;
            }
        }

        return false;
    }

    //The description of this filter
    public String getDescription() {
        return "Just Images";
    }
}

to set the view try 

            private JFileChooser fc;

            fc = new JFileChooser();

            //Add a custom file filter and disable the default
            //(Accept All) file filter.
            fc.addChoosableFileFilter(new ImageFilter());

HERE is a tutorial on FileChoosers/fiters

Note you will find the class Utils at the above location

Cheers lads, thanks