title: how to check protocol present in url or not?
body: <p>how to check protocol is present in URL , if not present need to append it.
  is there any class to achieve this in java?
  eg: String URL = www.google.com</p>
  
  <p>need to get <a href="http://www.google.com" rel="noreferrer">http://www.google.com</a></p>