int function ( ) { return items . size ( ) ; }
it returns the number of items that compose the itemset . concode_field_sep List<Item> items concode_elem_sep long timestamp concode_field_sep void addItem concode_elem_sep void addItem concode_elem_sep void removeItem concode_elem_sep Item removeItem concode_elem_sep List<Item> getItems concode_elem_sep Itemset cloneItemset concode_elem_sep long getTimestamp concode_elem_sep int hashCode concode_elem_sep Item get concode_elem_sep Itemset cloneItemSetMinusItems concode_elem_sep boolean equals concode_elem_sep String toString concode_elem_sep void setTimestamp