code: public static boolean getAt(BitSet self, int index) {
          int i = normaliseIndex(index, self.length());
          return self.get(i);
      }
docs: Support the subscript operator for a Bitset
  
  @param self  a BitSet
  @param index index to retrieve
  @return value of the bit at the given index
  @see java.util.BitSet
  @since 1.5.0