JMenuItem menu1 = new JMenuItem( "Delete"));
JMenuItem menu2 = new JMenuItem( "Add"));

JPopupMenu2.add(menu1);
JPopupMenu2.add(menu2);

menu1.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
    //delete处理
    }
});
menu2.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
    //add处理
    }
});