@Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException 
    {
        String[][] courses;
        sAct.getColumns();
        for(int i = 0; i < sAct.getColumns(); i++)
        {
            String rButton = request.getParameter("present"+i);
            // compare selected value 
            if ("present".equals(rButton))
            {
                System.exit(0);
            }
        }
        
        String q2 = request.getParameter("Q2");
        // compare selected value 
        if ("a".equals(q2))
        {
            
        }
    }