code: public static boolean isNullOrEmptyOrBlank(final CharSequence s) {
          if (N.isNullOrEmpty(s)) {
              return true;
          }
  
          for (int i = 0, len = s.length(); i < len; i++) {
              if (Character.isWhitespace(s.charAt(i)) == false) {
                  return false;
              }
          }
  
          return true;
      }
docs: DON'T change 'OrEmptyOrBlank' to 'OrBlank' because of the occurring order in the auto-completed context menu.