Using Jsoup to automatic bulleted for headers in HTML

autolist.java

private static String autolist(String html) {
    Document document = Jsoup.parse(html);
    Elements headers = document.select("h1,h2,h3,h4,h5,h6");
    int n[] = new int[] { 0, 0, 0, 0, 0, 0, 0 };
    for (Element header : headers) {
        String tag = header.tagName().toLowerCase();
        String text = header.text();
        if ("h1".equals(tag)) {
            header.text((++n[1]) + " " + text);
            n[2] = n[3] = n[4] = n[5] = n[6] = 0;
        } else if ("h2".equals(tag)) {
            header.text((n[1]) + "." + (++n[2]) + " " + text);
            n[3] = n[4] = n[5] = n[6] = 0;
        } else if ("h3".equals(tag)) {
            header.text((n[1]) + "." + (n[2]) + "." + (++n[3]) + " " + text);
            n[4] = n[5] = n[6] = 0;
        } else if ("h4".equals(tag)) {
            header.text((n[1]) + "." + (n[2]) + "." + (n[3]) + "." + (++n[4]) + " " + text);
            n[5] = n[6] = 0;
        } else if ("h5".equals(tag)) {
            header.text((n[1]) + "." + (n[2]) + "." + (n[3]) + "." + (n[4]) + "." + (++n[5]) + " " + text);
            n[6] = 0;
        } else if ("h6".equals(tag)) {
            header.text((n[1]) + "." + (n[2]) + "." + (n[3]) + "." + (n[4]) + "." + (n[5]) + "." + (++n[6]) + " " + text);
        }
    }
    return document.toString();
}