Swing - JComboBox Event

To implement event in JComboBox, use:

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class Main{

    public static void main(String[] args){

        new Main();

    }

    public Main(){

        frame = new JFrame("JComboBox Event");

        model = new DefaultComboBoxModel();

        model.addElement("Lady Gaga");

        model.addElement("Aura Kasih");

        model.addElement("Luna Maya");

        cbData = new JComboBox(model);

        cbData.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent ae){

                JComboBox cb = (JComboBox) ae.getSource();

                Object obj = cb.getSelectedItem();

                JOptionPane.showMessageDialog(frame,

                         "You selected: "+obj.toString());

            }

        });

        frame.add(cbData);

        frame.setLayout(new FlowLayout(FlowLayout.CENTER));

        frame.setSize(400, 300);

        frame.setLocation(200, 100);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setVisible(true);

    }

    private JFrame frame;

    private JComboBox cbData;

    private DefaultComboBoxModel model;

}

Swing - JComboBox Event