public override Poruka Send(Korisnik reciever) { throw new NotImplementedException(); }
public override Poruka Recieve(Korisnik sender) { throw new NotImplementedException(); }
abstract public Poruka Recieve(Korisnik sender);
public TekstPoruka() { Korisnik k = new Korisnik(); //ovo je vjerojatno suvisno }
abstract public Poruka Send(Korisnik reciever);