Java MyFile extends File
===

I am very very new to java and trying to extend File class to add some more methods and properties to it with below class


    import java.io.File;

    public class RecordingFile extends File {
	private static final long serialVersionUID = -4774703382591639948L;
	String RecordingNameFormatted;
	String RecordingDurationFormatted;
	String RecordingSizeFormatted;
	String RecordingDateFormatted;
	String RecordingBitrateFormatted;
	
	public RecordingFile(String path) {
		super(path);
		File f = new File(path);
		RecordingNameFormatted = f.getName().replace(".mp3", "");
		RecordingDurationFormatted = Utils.millisecondsToHours(Utils.getMp3DurationPureJava(f));
		RecordingSizeFormatted = Utils.humanReadableByteCount(f.length(), true);
		RecordingDateFormatted = Utils.longToDate(f.lastModified());
		RecordingBitrateFormatted = Utils.getBitratePureJava(f) +"Kbps";
	}
    }


Above doesn't work properly. I am not even sure if

    	File f = new File(path);

supposed to be there. For example when I try this


    ArrayList<RecordingFile> ret = new ArrayList<RecordingFile>();
		RecordingFile filesDir = new RecordingFile(path);
		if (!filesDir.exists()) {
			filesDir.mkdirs();
		}
		RecordingFile[] list = filesDir.listFiles();

Eclipse tells me that "Type mismatch: cannot convert from File[] to RecordingFile[]"
How can i just extend File class by adding couple more properties/methods to it?