Extend a class and nothing happens?

[Robert9]

Are there classes, i can not extend?
How can I check if a class is extended?

Real world example:

XML:

<?xml version="1.0" encoding="utf-8"?>
<class_extensions>
  <extension from_class="XF\ForumType\AbstractHandler" to_class="Xencafe\Lala\XF\ForumType\AbstractHandler" execute_order="1000" active="1"/>
 </class_extensions>

Code:

<?php
namespace Xencafe\Lala\XF\ForumType;

use XF\Entity\Forum;

class AbstractHandler extends XFCP_AbstractHandler
{
    public function...

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Extend a class and nothing happens?

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