The cancer-color proliferation also has created some quirky chromatic overlaps. Orange represents two cancers (kidney, leukemia). Green stands for three (liver, lymphoma gall bladder). Variations of purple signify six (pancreatic, testicular, leiomyosarcoma, Hodgkin lymphoma, stomach and esophageal).
If the container is empty, then begin() == end(); All standard iterator and container types behave the same in this regard: Â§23.2.1 [container.requirements.general] p6. begin() returns an iterator referring to the first element in the container.
HashSet doesnât maintain any order, the elements would be returned in any random order. 1  HashSet doesnât allow duplicates. If you try to add a duplicate element in HashSet, the old value would be overwritten. 2  HashSet allows null values however if you insert more than one nulls it would still return only one null value. 3  HashSet is non-synchronized. The iterator returned by this class is fail-fast which means iterator would throw ConcurrentModificationException if HashSet has been modified after creation of iterator, by any means except iteratorâs own remove method. HashSet Example