studentTable.setEditable(true);
        firstNameColumn.setCellFactory(TextFieldTableCell.forTableColumn());
        firstNameColumn.setOnEditCommit(new EventHandler<CellEditEvent<Students, String>>(){
          @Override
            public void handle(CellEditEvent<Students, String> t) {
                Students temp = t.getRowValue();
                String newTitle = t.getNewValue();
                temp.setFirstname(newTitle);
                updateStudent(temp);
            }
        });