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   public void printCalendarByID(HttpServletRequest request, HttpServletResponse response)            throws SQLException, IOException {        String id = request.getParameter("id");        CRSManager c = new CRSManager();        if(!id.equals("")){            if(c.isCorrectID(dbcon,id)){            printTop(request,response);            PrintWriter out = response.getWriter();            Date d2 = c.getMaxDate(dbcon, id);            Date d1 = c.getMinDate(dbcon, id);            GregorianCalendar gc1 = new GregorianCalendar();            GregorianCalendar gc2 = new GregorianCalendar();            GregorianCalendar begin = new GregorianCalendar();            gc1.setTime(d1);            gc2.setTime(d2);            gc1.set(Calendar.DAY_OF_MONTH,1);            SimpleDateFormat monthfrmt = new SimpleDateFormat("MMMM");            SimpleDateFormat dayfrmt = new SimpleDateFormat("");                int endday = gc2.get(Calendar.DAY_OF_MONTH);            for(;!gc1.equals(gc2); gc1.add(Calendar.DAY_OF_MONTH,1)){                if(gc1.get(Calendar.DAY_OF_MONTH)==1){                    out.println("<br><center><h3>"+monthfrmt.format(gc1.getTime())+"</h3></center>");                    out.println("<center><table width=\"900\" border=\"2\"cellpadding=\"4\">\n" +                            "  <tr>\n" +                            "    <td><center>Monday</center></td>\n" +                            "    <td><center>Tuesday</center></td>\n" +                            "    <td><center>Wednesday</center></td>\n" +                            "    <td><center>Thursday</center></td>\n" +                            "    <td><center>Friday</center></td>\n" +                            "  </tr>");                    if((gc1.get(Calendar.DAY_OF_WEEK)==Calendar.MONDAY)){                        int day = gc1.get(Calendar.DAY_OF_MONTH);                        if(day!=1){                            day = day-1;                        }                    out.println("<tr><td height=\"100\"valign=\"top\"><center>"+day+"</center></td>");                } else if(gc1.get(Calendar.DAY_OF_WEEK)==Calendar.TUESDAY){                        int day = gc1.get(Calendar.DAY_OF_MONTH);                        if(day!=1){                            day = day-1;                        }                    out.println("<td height=\"100\"valign=\"top\"></td><td height=\"100\"valign=\"top\"><center>"+day+"</center></td>");                } else if(gc1.get(Calendar.DAY_OF_WEEK)==Calendar.WEDNESDAY){                        int day = gc1.get(Calendar.DAY_OF_MONTH);                        if(day!=1){                            day = day-1;                        }                    out.println("<td height=\"100\"valign=\"top\"></td><td height=\"100\"valign=\"top\"></td>" +                            "<td height=\"100\"valign=\"top\"><center>"+day+"</center></td>");                } else if(gc1.get(Calendar.DAY_OF_WEEK)==Calendar.THURSDAY){                        int day = gc1.get(Calendar.DAY_OF_MONTH);                        if(day!=1){                            day = day-1;                        }                    out.println("<td height=\"100\"valign=\"top\"></td><td height=\"100\"valign=\"top\"></td>" +                            "<td height=\"100\"valign=\"top\"></td><td height=\"100\"valign=\"top\"><center>"+day+"</center></td>");                } else if(gc1.get(Calendar.DAY_OF_WEEK)==Calendar.FRIDAY){                        int day = gc1.get(Calendar.DAY_OF_MONTH);                        if(day!=1){                            day = day-1;                        }                    out.println("<td height=\"100\"valign=\"top\"></td>" +                            "<td height=\"100\"valign=\"top\"></td>" +                            "<td height=\"100\"valign=\"top\"></td>" +                            "<td height=\"100\"valign=\"top\"></td>" +                            "<td height=\"100\"valign=\"top\"><center>"+day+"</center></td>");                    }                } else if(gc1.get(Calendar.DAY_OF_MONTH)==31){                    out.println("</center></table>");                } else if(gc1.get(Calendar.DAY_OF_MONTH)==30){                          out.println("</center></table>");                } else if(gc1.get(Calendar.DAY_OF_MONTH)==29){                    out.println("</center></table>");                } else if(gc1.get(Calendar.DAY_OF_MONTH)==28){                    out.println("</center></table>");                                }                else if(gc1.get(Calendar.DAY_OF_WEEK)==Calendar.MONDAY){                    out.println("<tr><td height=\"100\"valign=\"top\"><center>"+gc1.get(Calendar.DAY_OF_MONTH)+"</center></td>");                } else if(gc1.get(Calendar.DAY_OF_WEEK)==Calendar.TUESDAY){                    out.println("<td height=\"100\"valign=\"top\"><center>"+gc1.get(Calendar.DAY_OF_MONTH)+"</center></td>");                } else if(gc1.get(Calendar.DAY_OF_WEEK)==Calendar.WEDNESDAY){                    out.println("<td height=\"100\"valign=\"top\"><center>"+gc1.get(Calendar.DAY_OF_MONTH)+"</center></td>");                } else if(gc1.get(Calendar.DAY_OF_WEEK)==Calendar.THURSDAY){                    out.println("<td height=\"100\"valign=\"top\"><center>"+gc1.get(Calendar.DAY_OF_MONTH)+"</center></td>");                } else if(gc1.get(Calendar.DAY_OF_WEEK)==Calendar.FRIDAY){                    out.println("<td height=\"100\"valign=\"top\"><center>"+gc1.get(Calendar.DAY_OF_MONTH)+"</center></td></tr>");                }            }            printBottom(request,response);            } else {               printTop(request,response);            PrintWriter out = response.getWriter();            out.println("<span class=\"message\">You entered an invalid ID number please go back</span>");            printBottom(request,response);             }    } else {            printTop(request,response);            PrintWriter out = response.getWriter();            out.println("<span class=\"message\">You entered an invalid ID number please go back</span>");            printBottom(request,response);        }        }