En el actionperformed haga que un boton pueda eliminar un dato registrado tipo codigo de una base de datos

public void actionPerformed(ActionEvent e){
  if(e.getSource()==b1){
    try{
      String n=t1.getText();
      String q="delete from student where rollno="+n;
      Statement stm=con.createStatement();
      stm.executeUpdate(q);
      JOptionPane.showMessageDialog(null,"Record Deleted");
    }
    catch(Exception ee){
      JOptionPane.showMessageDialog(null,"Record Not Deleted");
    }
  }