public Nguoi(int Ma, string Ten, int Sdt, LopHoc lh, Diachi dc)
{
ma = Ma;
ten = Ten;
sdt = Sdt;
LopHoc = lh;
Diachi = dc;
}
public SinhVienBuilder addMaLop(LopHoc maLop)
{
LopHoc = maLop;
return(this);
}