title: What does <> mean in a classname?
body: <p>My question is what does this:<br><code>&lt;RecentActivity, RecentActivityController&gt;</code></p>
  
  <p>mean in this code:<br>
  <code>public class RecentActivity extends AbstractActionActivity&lt;RecentActivity, RecentActivityController&gt;</code></p>
  
  <p>Actually I want know the concept of the &lt; and > operators.
  Clould someone give references to learn about them?</p>