Auto Complete JComboBox

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.text.*;
public class AutoComplete extends JComboBox	implements JComboBox.KeySelectionManager
{
	private String searchFor;
	private long lap;
	public class CBDocument extends PlainDocument
	{
		public void insertString(int offset, String str, AttributeSet a) throws BadLocationException
		{
			if (str==null) return;
			super.insertString(offset, str, a);
			if(!isPopupVisible() && str.length() != 0) fireActionEvent();
		}
	}
	public AutoComplete(Object[] items)
	{
		super(items);
		lap = new java.util.Date().getTime();
		setKeySelectionManager(this);
		JTextField tf;
		if(getEditor() != null)
		{
			tf = (JTextField)getEditor().getEditorComponent();
			if(tf != null)
			{
				tf.setDocument(new CBDocument());
				addActionListener(new ActionListener()
				{
					public void actionPerformed(ActionEvent evt)
					{
						JTextField tf = (JTextField)getEditor().getEditorComponent();
						String text = tf.getText();
						ComboBoxModel aModel = getModel();
						String current;
						for(int i = 0; i < aModel.getSize(); i++)
						{
							current = aModel.getElementAt(i).toString();
							if(current.toLowerCase().startsWith(text.toLowerCase()))
							{
								tf.setText(current);
								tf.setSelectionStart(text.length());
								tf.setSelectionEnd(current.length());
								break;
							}
						}
					}
				});
			}
		}
	}
	public int selectionForKey(char aKey, ComboBoxModel aModel)
	{
		long now = new java.util.Date().getTime();
		if (searchFor!=null && aKey==KeyEvent.VK_BACK_SPACE &&	searchFor.length()>0)
		{
			searchFor = searchFor.substring(0, searchFor.length() -1);
		}
		else
		{
			//	System.out.println(lap);
			// Kam nie hier vorbei.
			if(lap + 1000 < now)
				searchFor = "" + aKey;
			else
				searchFor = searchFor + aKey;
		}
		lap = now;
		String current;
		for(int i = 0; i < aModel.getSize(); i++)
		{
			current = aModel.getElementAt(i).toString().toLowerCase();
			if (current.toLowerCase().startsWith(searchFor.toLowerCase())) return i;
		}
		return -1;
	}
	public void fireActionEvent()
	{
		super.fireActionEvent();
	}
	public static void main(String arg[])
	{
		JFrame f = new JFrame("AutoCompleteComboBox");
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setSize(200,300);
		Container cp= f.getContentPane();
		cp.setLayout(null);
		//String[] names= {"Beate", "Claudia", "Fjodor", "Fred", "Friedrich",	"Fritz", "Frodo", "Hermann", "Willi"};
		//JComboBox cBox= new AutoComplete(names);
		Locale[] locales = Locale.getAvailableLocales();//
		JComboBox cBox= new AutoComplete(locales);
		cBox.setBounds(50,50,100,21);
		cBox.setEditable(true);
		cp.add(cBox);
		f.setVisible(true);
	}
}