title: JFlex - how to test the scanner
body: <p>I've just started to learn JFlex. I am studying one of the official Jflex examples, which is a scanner for the Java language. In the Readme file it says:</p>
  
  <pre><code>The scanner (without parser attached) can be test with:
  java TestLexer &lt;inputfiles&gt;
  </code></pre>
  
  <p>But when I tried this in cmd, I got an error message instead, saying 'Could not find or load main class TestLexer'.Does anyone know why? Thank you in advance.</p>