title: Differences between Log and Logger?
body: <p>I have seen people use this way:</p>
  
  <pre><code>Logger logger = Logger.getLogger("com.foo");
  </code></pre>
  
  <p>and I have seen the other way:</p>
  
  <pre><code>Log log = LogFactory.getLog(CLASS.class);
  </code></pre>
  
  <p>What's the differences behind them? Thanks.</p>