public class Kaninbur implements Oppholdsomrade {
    Kanin[] antKaniner;
    
    Kaninbur(int stoerrelse) {
        antKaniner = new Kanin[stoerrelse];
    }

    public Kanin settInnKanin(Kanin kanin) throws IkkeMerPlassException {
        for (int i = 0; i < antKaniner.length; i++) {
            if (antKaniner[i] == null) {
                antKaniner[i] = kanin;
                return kanin;
            }
        }
        throw new IkkeMerPlassException(kanin.farge);
    }
    public Kanin taUtKanin(Kanin kanin) {
        for (int i = 0; i < antKaniner.length; i++) {
            if (antKaniner[i] == kanin) {
                antKaniner[i] = null;
                return kanin;
            }
        }
        return null;
    }
    public int tellAntallKaniner() {
        int teller = 0;
        for (int i = 0; i < antKaniner.length; i++) {
            if (antKaniner[i] != null) teller++;
        }
        return teller;
    }
}