This filter accepts Files that are directories : FileFilter « File « Java Tutorial

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import java.io.File;
import java.io.FilenameFilter;

/**
 * This filter accepts <code>File</code>s that are directories.
 * Eg., here is how to print out a list of the current directory's subdirectories:
 *
 * <pre>
 * File dir = new File(".");
 * String[] files = dir.list( new DirectoryFileFilter() );
 * for ( int i=0; i&lt;files.length; i++ )
 * {
 *     System.out.println(files[i]);
 * }
 * </pre>
 *
 * @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</a>
 * @version $Revision: 494012 $ $Date: 2007-01-08 11:23:58 +0100 (Mo, 08 Jan 2007) $
 * @since 4.0
 */
public class DirectoryFileFilter
    implements FilenameFilter
{
    public boolean accept( final File file, final String name )
    {
        return new File( file, name ).isDirectory();
    }
}