returns the number of items in this bag . concode_field_sep Node<Item> next concode_elem_sep Item item concode_elem_sep Node<Item> current concode_elem_sep int N concode_elem_sep Node<Item> first concode_field_sep void add concode_elem_sep Item next concode_elem_sep Iterator<Item> iterator concode_elem_sep boolean isEmpty concode_elem_sep boolean hasNext concode_elem_sep void main concode_elem_sep void remove
int function ( ) { return N ; }