code: private FieldPosition[] getNegativeSuffixFieldPositions() {
          if (negativeSuffixFieldPositions == null) {
              if (negSuffixPattern != null) {
                  negativeSuffixFieldPositions = expandAffix(negSuffixPattern);
              } else {
                  negativeSuffixFieldPositions = EmptyFieldPositionArray;
              }
          }
          return negativeSuffixFieldPositions;
      }
docs: Returns the FieldPositions of the fields in the suffix used for
  negative numbers. This is not used if the user has explicitly set
  a negative suffix via <code>setNegativeSuffix</code>. This is
  lazily created.
  
  @return FieldPositions in positive prefix