abstract class Dyr implements Comparable<Dyr> {

    private String navn;
    private int alder;
    private boolean akutt;

    public Dyr(String navn, int alder, boolean akutt) {
        this.navn = navn;
        this.alder = alder;
        this.akutt = akutt;
    }

    public String hentNavn() {
        return navn;
    }

    public int hentAlder() {
        return alder;
    }

    abstract String hentArt();

    public boolean erAkutt() {
        return akutt;
    }

    public void erAkutt(boolean akutt) {
        this.akutt = akutt;
    }

    @Override
    public int compareTo(Dyr annetDyr) {
        if (this.erAkutt() && !annetDyr.erAkutt()) {
            return -1;
        } else if (!this.erAkutt() && annetDyr.erAkutt()) {
            return 1;
        }
        return Integer.compare(this.alder, annetDyr.alder);
    }

    @Override
    public String toString() {
        return (
            hentArt() +
            ": " +
            navn +
            ", alder " +
            alder +
            (erAkutt() ? ", akutt" : "")
        );
    }
}