新手求教,问大家一个有关问题,给讲解一上

public static void main(String[] args) throws Exception, IOException {        Document document = Jsoup.parse(new URL("http://www.lvping.com/hotels-d1-beijing"), 2000);        Elements doc = document.select("a");        printElements(document.children(), 0);    }    public static void printElements(Elements elements, int i) {        i++;        for (Element element : elements) {            if (element.children().size() > 0) {//                 System.out.println(i + "|" + Strings.repeat("-",//                 i));//可以注释掉这行看效果                printElements(element.children(), i);            } else {                if (!Strings.isNullOrEmpty(element.text().trim()))                    System.out.println(element.nodeName());                System.out.println(i + "|" + Strings.repeat("-", i) + ""                        + element.text());            }        }    }