title: Which are Java's system classes?
body: <p>When reading some documentation about assertions, I found:</p>
  
  <pre><code>java -ea -dsa 
  </code></pre>
  
  <blockquote>
    <p>"Enables assertions in general, but
    disables assertions in system
    classes."</p>
  </blockquote>
  
  <p>Which are the system classes?</p>