code: public static int compare(String one, String two) {
  
  		if (one == null && two == null) {
  			return 0;
  		}
  
  		if (one == null) {
  			return -1;
  		}
  
  		if (two == null) {
  			return 1;
  		}
  
  		return one.compareTo(two);
  	}
docs: Compares two strings with <code>String.compare()</code>. Method allows
  <code>null</code> values.
  
  @param one to compare
  @param two to compare
  @return <b>0</b> if both <code>null</code>, <b>-1</b> if <code>one</code> is <code>null</code>, <b>1</b> if <code>two</code> is <code>null</code>, otherwise <code>String.compare()</code> is
  called