import java.util.LinkedList;
import java.util.List;

public class ReferanseType {
    public static void main(String[] args) {
        List<String> strengListe = new LinkedList<>();
        LinkedList<String> castetListe = (LinkedList <String>) strengListe;
        
        strengListe.add("ahmed");
        System.out.println(castetListe.peekFirst());

        System.out.println("Kjorte uten feil.");
    }
}