question: public int nextClearBit ( int fromIndex ) { int i = fromIndex > > ADDRESS_BITS ; int max = data . length ; for ( ; i < max ; i ++ ) { if ( data [ i ] == - 1 ) { continue ; } int j = Math . max ( fromIndex , i << ADDRESS_BITS ) ; for ( int end = j + 64 ; j < end ; j ++ ) { if ( ! get ( j ) ) { return j ; } } } return max << ADDRESS_BITS ; }
target:  Get the index of the next bit that is not set.