for (Registration registration : RootDomainObject.getInstance().getStudents()) {
for (Registration registration : RootDomainObject.getInstance().getRegistrations()) {
	public static List<Registration> readAllStudentsBetweenNumbers(Integer fromNumber, Integer toNumber) {		int fromNumberInt = fromNumber.intValue();		int toNumberInt = toNumber.intValue();		int studentNumberInt;		List<Registration> students = new ArrayList();		for (Registration registration : RootDomainObject.getInstance().getStudents()) {			studentNumberInt = registration.getNumber().intValue();			if (studentNumberInt >= fromNumberInt && studentNumberInt <= toNumberInt) {				students.add(registration);			}		}		return students;	}