Demonstrating the PopupMenuListener

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 PopupTest {
  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.show();
  }
}

1.	Demonstrating the WindowListener with a WindowAdapter
2.	Demonstrating the ActionListener
3.	Demonstrating the AdjustmentListener
4.	Demonstrating the AncestorListener
5.	Demonstrating the ComponentListener
6.	Demonstrating the ContainerListener
7.	Demonstrating the FocusListener
8.	Demonstrating the HyperlinkListener
9.	Demonstrating the InternalFrameListener
10.	Demonstrating the ItemListener
11.	Demonstrating the KeyListener
12.	Demonstrating the MenuListener
13.	Demonstrating the MouseListener and MouseMotionListener
14.	Demonstrating the MouseWheelListener
15.	Demonstrating the WindowListener
16.	Responding to Keystrokes

Demonstrating the PopupMenuListener : Various Event Listener « Swing JFC « Java

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