Returns the number of bits of space actually in use by this {@code BitSet} to represent bit values. The maximum element in the set is the size - 1st element.
@return the number of bits currently in this bit set
See Implementation
Returns the number of bits of space actually in use by this {@code BitSet} to represent bit values. The maximum element in the set is the size - 1st element.
@return the number of bits currently in this bit set