title: Dart Lanuage Question - what is the meaning of <RandomWords>
body: <p>what does <code>&lt;RandomWords&gt;</code> mean? what is this grammar of Dart language? </p>
  
  <pre><code>class RandomWords extends StatefulWidget {
    @override
    State createState() {
    return new RandomWordsState();
   }
  }
  
  class RandomWordsState extends State&lt;RandomWords&gt;{
    @override
    Widget build(BuildContext context) {
  
      return new Scaffold(
  
      );
   }
  }
  </code></pre>
  
  <p>what does <code>&lt;RandomWords&gt;</code> mean? what is this grammar of Dart language?</p>