Displaying a menu when right clicking on a cell

Try this:

import javax.swing.event.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
 
public class Main extends JFrame 
{
   JTable table;
   TablePopup tablePopup;
 
   public Main() {
      super("Table example, Wines from Bordeaux");
 
      Object[][] tabledata = {
            { "Chateau Meyney, St. Estephe", 	   new Integer(1994), "$18.75"},
            { "Chateau Montrose, St. Estephe", 	   new Integer(1975), "$54.25" },
            { "Chateau Gloria, St. Julien", 	   new Integer(1993), "$22.99" },
            { "Chateau Beychevelle, St. Julien",   new Integer(1970), "$61.63" },
            { "Chateau La Tour de Mons, Margeaux", new Integer(1975), "$57.03" },
            { "Chateau Brane-Cantenac, Margeaux",  new Integer(1978), "$49.92" },
      };
 
      String columnheaders[] = { "Wine", "Vintage", "Price" };
 
      table = new JTable(tabledata, columnheaders);
      table.setPreferredScrollableViewportSize(new Dimension(500, 70));
      JScrollPane scrollPane = new JScrollPane(table); 
      tablePopup = new TablePopup(table);
 
      table.addMouseListener(new MouseAdapter() {
            public void mouseReleased (MouseEvent e) {
                if (e.isPopupTrigger()) {
                   tablePopup.show (e.getComponent(), e.getX(), e.getY());
                }
            }
      });
  
      getContentPane().add(scrollPane);
 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent we) {
            System.exit(0);
         }
      });
 
      pack();
   }
 
   public static void main(String []args) {
      Main main = new Main();
      main.show();
   }
 
   class TablePopup extends JPopupMenu {
      public TablePopup(JTable table) {
         JMenuItem itemDelete = new JMenuItem("Delete row");
         JMenuItem itemAdd = new JMenuItem("Add row");
         itemDelete.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
               System.out.println("Delete row");
            }
         });
         itemAdd.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
               System.out.println("Add row");
            }
         });
 
         add(itemDelete);
         add(new JSeparator());
         add(itemAdd);
      }
   }
}