Reminder Cleans up After Itself

package Reminder;

import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.text.DateFormat;
import java.util.Date;
import java.util.logging.Handler;
import java.util.logging.Logger;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JWindow;

public class DistributedReminderGUI
    extends WindowAdapter
    implements Runnable, ClipboardOwner {

    private static Logger logger = Logger.getLogger("Reminder");
    private DistributedReminderGUIHistory historyView;

    public DistributedReminderGUI() {
	Handler messageLog = null;
	messageLog = (Handler)new DistributedReminderHandler();
	messageLog.setFormatter(new DistributedReminderXMLFormatter());

	logger.addHandler(messageLog);
    }

    public void copyToClipboard(String content) {
	Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
	StringSelection selection = new StringSelection(content);
	cb.setContents((Transferable)selection, this);
    }

    // ClipboardOwner
    public void lostOwnership(Clipboard clipboard, Transferable contents) { 
	return;
    }

    JTextField field = new JTextField();
    // Runnable
    public void run() {
	DateFormat now = DateFormat.getDateTimeInstance();
	try {
	    Toolkit.getDefaultToolkit().beep();
	    JFrame frame = new JFrame(now.format(new Date()));
	    frame.addWindowFocusListener(this);
	    field.setText(System.getProperty("reminder.notificationMessage"));
	    field.setEditable(false);
	    frame.add(field);
	    frame.pack();
	    frame.setVisible(true);
	    this.copyToClipboard(field.getText());
	} catch (java.awt.HeadlessException e) {
	}
	logger.info(System.getProperty("reminder.notificationMessage"));
    }
    
    // WindowAdapter
    public void windowGainedFocus (WindowEvent e) {
	String contents = field.getText();
	this.copyToClipboard(contents);
    }
    
    protected void finalize() throws Throwable {
	File[] xmlBackups = null;
	int i = 0;
	File rootDirectory = new File("..");
	xmlBackups = rootDirectory.listFiles(new FilenameFilter() {
		public boolean accept(File dir, String name) {
		    return (name.endsWith(".lck") || name.matches(".[0-9]+.xml"));
		}
	    });
	for (i = 0; i!= xmlBackups.length;i++) {
	    xmlBackups[i].delete();
	    logger.info(xmlBackups[i].getName()+" deleted!");
	}
    }
}