Showing a popup-menu when a user right-clicks on an element in a JList

This example creates a JList and shows a popupmenu only when the user clicked on the selected item.
Main.java:

import javax.swing.event.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.awt.*;
  
public class Main extends JFrame {
 
   public Main() {
      getContentPane().setLayout(new FlowLayout());
 
      final DefaultListModel listModel = new DefaultListModel();   
 
      // populate listmodel
      for (int i=0; i<5; i++) {
         listModel.addElement("list item #" + i);
      }
 
      final JList list = new JList(listModel); 
      getContentPane().add(new JScrollPane(list));    
 
      final JPopupMenu popupMenu = new JPopupMenu();
      popupMenu.add(new JMenuItem("PopupItem 1"));
      popupMenu.add(new JMenuItem("PopupItem 2"));
      popupMenu.add(new JPopupMenu.Separator());
      popupMenu.add(new JMenuItem("PopupItem 3"));
 
      list.addMouseListener(new MouseAdapter() {
         public void mouseClicked(MouseEvent me) {
            if (SwingUtilities.isRightMouseButton(me)    // if right mouse button clicked
                  && !list.isSelectionEmpty()            // and list selection is not empty
                  && list.locationToIndex(me.getPoint()) // and clicked point is
                     == list.getSelectedIndex()) {       //   inside selected item bounds
               popupMenu.show(list, me.getX(), me.getY());
            }
         }
      });
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent event) {
            System.exit(0);   
         }      
      });
 
      pack();
   }
   
   public static void main(String[] args) {
      (new Main()).show();
   }
}