Modify the method breadth First Traverse () (Figure 15–21) so that it returns an Iterator instead of a List. Your version should not simply create a List and then ask it for an Iterator. Instead,...

Modify the method breadth First Traverse () (Figure 15–21) so that it returns an Iterator instead of a List. Your version should not simply create a List and then ask it for an Iterator. Instead, create a Breadth First Graphterator class which maintains the queue and the set of visited vertices.

Figure 15–21