public boolean checkPossibleToEnrolInExistingGroup(IGrouping grouping, IStudentGroup studentGroup, IShift shift) {
public boolean checkPossibleToEnrolInExistingGroup(IGrouping grouping, IStudentGroup studentGroup) {
    public boolean checkPossibleToEnrolInExistingGroup(IGrouping grouping, IStudentGroup studentGroup,            IShift shift) {        final int numberOfElements = studentGroup.getAttendsCount();        final Integer maximumCapacity = grouping.getMaximumCapacity();        if (maximumCapacity == null)            return true;        if (numberOfElements < maximumCapacity)            return true;        return false;    }