9. JCombobox - Dropdwon list of images

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

public class Gui extends JFrame{

    // Variables
    private JComboBox box;      // dropdown list
    private JLabel picture;
    private static String[] filename = {"b.png", "x.png"};      // Images' names
    private Icon[] pics = {new ImageIcon(getClass().getResource(filename[0])), new ImageIcon(getClass().getResource(filename[1]))};     // Actual images

    // Constructor
    public Gui(){

        super("JFrame's title");
        setLayout(new FlowLayout());
        box = new JComboBox(filename);      // Puts all array's elements in a dropdown list
        // Functionality with item listener
        box.addItemListener(
                // Anonymus inner class
                new ItemListener() {
                    @Override
                    public void itemStateChanged(ItemEvent event) {
                        if(event.getStateChange() == ItemEvent.SELECTED)
                            picture.setIcon(pics[box.getSelectedIndex()]);
                    }
                }
        );
        add(box);
        picture = new JLabel(pics[0]);      // Default value
        add(picture);
    }

    // Main Function
    public static void main(String[] args){
        Gui gui = new Gui();
        gui.setDefaultCloseOperation(EXIT_ON_CLOSE);
        gui.setSize(600, 600);
        gui.setVisible(true);
    }

}