title: How to add a List of Parent objects to a List of Child Objects
body: <p>Consider a parent class named <code>PowerHost</code>. Consider a child class named <code>PowerHostHistory</code> which is like this:</p>
  
  <pre><code>PowerHostHistory extends PowerHost
  </code></pre>
  
  <p>I have a list of child class defined like this which is constantly filled with <code>PowerHostHistory</code> objects.</p>
  
  <pre><code>List&lt;PowerHostHistory&gt; excludedHosts = new LinkedList&lt;PowerHostHistory&gt;();
  </code></pre>
  
  <p>Now, in a bit different way, I am going to add a list of <code>PowerHost</code> objects to my <code>excludedHosts</code>.</p>
  
  <p>I want to add a list of parent objects to a list of child objects. Is that possible, and how?</p>