import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class PopupPanel extends JPanel {
                      JPopupMenu popup = new JPopupMenu ();
                      public PopupPanel() {
                        JMenuItem item;
                        popup.add (item = new JMenuItem ("Cut"));
                        popup.add (item = new JMenuItem ("Copy"));
                        popup.add (item = new JMenuItem ("Paste"));
                        popup.addSeparator();
                        popup.add (item = new JMenuItem ("Select All"));
                        popup.setInvoker (this);
                        addMouseListener (new MouseAdapter() {
                          public void mousePressed (MouseEvent e) {
                            if (e.isPopupTrigger()) {
                              popup.show (e.getComponent(), 
                                e.getX(), e.getY());
                            }
                          }
                          public void mouseReleased (MouseEvent e) {
                            if (e.isPopupTrigger()) {
                              popup.show (e.getComponent(), 
                                e.getX(), e.getY());
                            }
                          }
                        });
                      }
                    }