// Add course method
public void addCourse() {
try {
Database db = new Database();
String coursename = (String) coursecombobox.getSelectedItem();
if (coursecombobox.getSelectedIndex() == 0) {
throw new Exception("No course selected");
}
float fees = db.getCoursefees(coursename);
float totalfees = fees + (ims.main.Settings.getInstallment() * (int) spinner.getValue());
long id = (long) table.getValueAt((int) table.getSelectionModel().getMinSelectionIndex(), 0);
db.addCourseToCurrentStudent(id, totalfees, (int) spinner.getValue(), coursename);
updateFeesData(id);
courseReset();
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.getMessage(), null, JOptionPane.ERROR_MESSAGE);
}
}
