title: Checking if a file or directory exists in Java
body: <p>From <a href="http://docs.oracle.com/javase/tutorial/essential/io/check.html" rel="nofollow noreferrer">this</a> java tutorial by oracle:</p>
  <blockquote>
  <p>Note that !Files.exists(path) is not equivalent to
  Files.notExists(path).</p>
  </blockquote>
  <p>Why would they not be equivalent? it does not go any further in terms of explanation.
  Does anybody know more information about that?
  Thanks in advance!</p>