Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.awt.Container;

import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;

public class Main {
    public static void main(String args[]) {
        JFrame frame = new JFrame("Popup Menu Listener");
        Container contentPane = frame.getContentPane();

        final String flavors[] = { "Item 1", "Item 2", "Item 3" };

        PopupMenuListener listener = new PopupMenuListener() {
            boolean initialized = false;

            public void popupMenuCanceled(PopupMenuEvent e) {
            }

            public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
            }

            public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
                if (!initialized) {
                    JComboBox combo = (JComboBox) e.getSource();
                    ComboBoxModel model = new DefaultComboBoxModel(flavors);
                    combo.setModel(model);
                    initialized = true;
                }
            }
        };

        JComboBox jc = new JComboBox();
        jc.addPopupMenuListener(listener);
        jc.setMaximumRowCount(4);
        jc.setEditable(true);
        contentPane.add(jc, BorderLayout.NORTH);

        frame.pack();
        frame.setVisible(true);
    }
}