public Animal Dequeue()
{
if (first == null)
return null;
Animal returned = first;
first = first.next;
if (first == null)
last = null;
return returned;
}
public void Enqueue(Animal a)
{
if (last == null)
{
last = a;
first = a;
return;
}
last.next = a;
last = last.next;
}
public AnimalQueue()
{
first = null;
last = null;
}
public Animal()
{
timeArrived = DateTime.Now;
next = null;
}
