code: public static boolean equalsString(final String thisStr, final String thatStr) {
      if ((thisStr == null) && (thatStr == null)) {
        return true;
      }
  
      if (thisStr == null) {
        return false;
      }
  
      return thisStr.equals(thatStr);
    }
docs: Return true if Strings are equal including possible null
  
  @param thisStr
  @param thatStr
  @return boolean true for equal