import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

class gui
		extends 	JFrame
		implements	
					ListSelectionListener
 {
	// Instance attributes used in this example
	private	JPanel		topPanel;
	private	JList		listbox;
	private	Vector		listData;
	private	JScrollPane scrollPane;


	// Constructor of main frame
	public gui()
	{
		setTitle( "Hello world" );
		setSize( 300, 100 );
		setBackground( Color.gray );
		topPanel = new JPanel();
		topPanel.setLayout( new BorderLayout() );
		getContentPane().add( topPanel );
		listData = new Vector();
		listbox = new JList( listData );
		listbox.addListSelectionListener( this );
		scrollPane = new JScrollPane();
		scrollPane.getViewport().add( listbox );
		topPanel.add( scrollPane, BorderLayout.CENTER );
		CreateDataEntryPanel();
		setVisible(true);
	}


	public void CreateDataEntryPanel()
	{
		JPanel dataPanel = new JPanel();
		dataPanel.setLayout( new BorderLayout() );
		topPanel.add( dataPanel, BorderLayout.SOUTH );
	}

 	public void valueChanged( ListSelectionEvent event )
 	{
		if( event.getSource() == listbox
						&& !event.getValueIsAdjusting() )
		{
			// Get the current selection and place it in the
			// edit field
			String stringValue = (String)listbox.getSelectedValue();
			//if( stringValue != null )
			//	dataField.setText( stringValue );
		}
 	}

	public void add(String s){
				listData.addElement(s);
				listbox.setListData( listData );
				scrollPane.revalidate();
				scrollPane.repaint();
	}



}