is it correct?

     private NPC getClosestNPC(int x) {//Non complete yet
        List<NPC> closestAll = getNpcs().all(n-> n!=null && n.getName().equals("Artis dealer"));
        List<Double> distances = new List<Double>;
        for(NPC close: closestAll) {
            if(!distances.contains(close.distance(getLocalPlayer()))) {
                distances.add(close.distance(getLocalPlayer()));
            }
        }
        Arrays.sort(distances.toArray());

        if(x > distances.size())
            return getNpcs().closest(n->n!=null && n.getName().equals("Artis dealer")
			&& n.distance(getLocalPlayer()) == distances.get(x));
        else
            return null;
     }