1. If you use an array to store the underlying elements in a queue, what private instance variables are needed for the Queue class? 2. What is a ring buffer? How does the ring-buffer concept apply to...

1. If you use an array to store the underlying elements in a queue, what private instance variables are needed for the Queue class?

2. What is a ring buffer? How does the ring-buffer concept apply to queues?

3. How can you tell whether an array-based queue is empty? How can you tell whether it has reached its capacity?