title: How can I check if two ArrayList differ, I don't care what's changed
body: <p>How can I check if two ArrayLists differ from one another? I don't care what's the difference, I just want to know if they're not the same.</p>
  
  <p>I'm fetching scores list from a database every minute, and only if the scores list that I fetched is different from the one I fetched a minute ago I want to send it to the client.</p>
  
  <p>Now the value of the ArrayList is actually a class that I created (that contains name, lvl, rank, score).</p>
  
  <p>Do I need to implement <code>equals()</code> on it?</p>