小编Enz*_*nzo的帖子

使用此代码,我得到此输出:

 TreeSet<String> t=new TreeSet<String>();
  t.add("test 15");
  t.add("dfd 2");
  t.add("ersfd 20");
  t.add("asdt 10");


 Iterator<String> it=t.iterator();

 while(it.hasNext()){
   System.out.println(it.next);
 }

我明白了:

  asdt 10 
  dfd 2 
  ersfd 20 
  test 15

如何根据数字,使用TreeSet获得此类订单？

  dfd 2 
  asdt 10 
  test 15
  ersfd 20 

我想使用 id 标签提取属性“value”的值。

我的代码：

<?php
 $url = 'http://turni.tt-contact.com/Default.aspx';
 $contents = htmlentities(file_get_contents($url));
 echo $contents."\n"; //html
 $dom = new DOMDocument;
 $dom->validateOnParse = true;
 $dom->loadHTML($contents);
 $dom->preserveWhiteSpace = false;
 $data = $dom->getElementById("__VIEWSTATE");
 echo $data->nodeValue;
?>

我想要属性“值”->“这个”：

   <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="THIS">

但代码只返回 html 代码。

我需要改变什么？

也可以将其修改为：

$xpath = new DOMXpath($dom);
$data = $xpath->query('//input[@id="__VIEWSTATE"]');
$node = $data->item(0);
echo $node->getAttribute('value');

我收到此错误：

  Fatal error: Call to a member function getAttribute() on null 

我有一个像这样的字符串:

String a = "Barbara Liskov (born Barbara Jane Huberman on November 7, 1939"
+" in California) is a computer scientist.[2] She is currently the Ford"
+" Professor of Engineering in the MIT School of Engineering's electrical"
+" engineering and computer science department and an institute professor"
+" at the Massachusetts Institute of Technology.[3]";

我想,以取代所有这些元素:[1],[2],[3],等等,用一个空格.

我尝试过:

if (a.matches("([){1}\\d(]){1}")) {
    a = a.replace("");
}

但它不起作用!