public Dadabase() { patList = new List <Patient>(); staList = new List <Staff>(); quaList = new List <Qualification>(); depList = new List <Department>(); checkList = new List <CheckupFunction>(); subList = new List <SubclinicalServiceOrderFunction>(); prepList = new List <PrescriptionFunction>(); pf = new PatientFunction(patList); sf = new StaffFunction(staList, quaList); df = new DepartmentFunction(depList); }