问宽度优先搜索打印出凯文培根路径，重新访问节点？

EN

public List<String> findBaconPath (String actor) throws IllegalArgumentException {
    ArrayList<String> list = new ArrayList<String>();
    HashSet<String> visited = new HashSet<String>();
    visited.add(actor);
    LinkedList<String> bfs = new LinkedList<String>();
    bfs.add(actor);
    while (!bfs.isEmpty()){
        String curr = bfs.remove(); //The current actor we are looking at.
        visited.add(curr);
        HashSet<String> mov = myMovies.get(curr);
        Iterator<String> it = mov.iterator();
        while (it.hasNext()){
            String next = it.next(); //The next movie in the iterator.
            visited.add(next);
            HashSet<String> coStars = myMovies.get(next);
            coStars.removeAll(visited);
            if (coStars.contains("Bacon, Kevin")){
                list.add(curr);
                list.add(next);
                list.add("Bacon, Kevin");
                System.out.println(list.toString());
                return list;
            }
            else {
                list.add(curr);
                list.add(next);
                System.out.println("This is what is in visited: "+visited.toString());
                System.out.println("This is what is in coStars pre removal. "+ coStars.toString());
                coStars.removeAll(visited);
                System.out.println("This is what is in coStars post removal. "+ coStars.toString());
                Iterator<String> cos = coStars.iterator();
                while (cos.hasNext()){
                    bfs.add(cos.next());
                }
            }
        }

    }
    return list;
}