returns true if there are no items in the heap . concode_field_sep Comparator<T> comparator concode_elem_sep List<T> data concode_field_sep Iterator<T> iterator concode_elem_sep int size concode_elem_sep void swap concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep Heap<T> insert concode_elem_sep void bubbleUp concode_elem_sep String toString concode_elem_sep T extractExtreme concode_elem_sep void heapify concode_elem_sep void heapify concode_elem_sep T extreme
boolean function ( ) { return data . isEmpty ( ) ; }