title: In android programming, what's the meaning of a class name concatenated an underscore?
body: <pre class="lang-java prettyprint-override"><code>public class VideoFragment extends Fragment implements CacheListener {
         ...
   public static Fragment build(String url, String cachePath) {
          return VideoFragment_.builder()
                  .url(url)
                  .cachePath(cachePath)
                  .build();
      }
        ...
  }
  </code></pre>
  
  <p>I searched a lot, but still have no idea about "VideoFragment_"?
  Can someone give me some main points?</p>