Java Basic(69)-Drop Down List Program

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Gui extends JFrame{

private JComboBox box;

private JLabel picture;

private static String[] filename = {"b.png", "g.png"};

private Icon[] pics = {new ImageIcon(getClass().getResource(filename[0])),new ImageIcon(getClass().getResource(filename[1]))};

public Gui(){

super("the title");

setLayout(new FlowLayout());

box = new JComboBox(filename);

box.addItemListener(

new ItemListener(){

public void itemStateChanged(ItemEvent event){

if(event.getStateChange()==ItemEvent.SELECTED)

picture.setIcon(pics[box.getSelectedIndex()]);

}

}

);

add(box);

picture=new JLabel(pics[0]);

add(picture);

}

}