public void actionPerformed(ActionEvent e){
                String ID;
                int selectedRow = table.getSelectedRow();//ѡе
                ID=(String)tableModel.getValueAt(selectedRow, 0);
                if(selectedRow!=-1)  //ѡ
                {
                    tableModel.removeRow(selectedRow);  //ɾ
                }
                pwdBLL.delete(ID);
                JOptionPane.showMessageDialog(null,"ɾɹ");
            }