public class RandomizedQueue<Item> implements Iterable<Item> {
public RandomizedQueue() // construct an empty randomized queue
public boolean isEmpty() // is the randomized queue empty?
public int size() // return the number of items on the randomized queue
public void enqueue(Item item) // add the item
public Item dequeue() // remove and return a random item
public Item sample() // return a random item (but do not remove it)
public Iterator<Item> iterator() // return an independent iterator over items in random order
public static void main(String[] args) // unit testing (optional)
}
public class Deque<Item> implements Iterable<Item> {
public Deque() // construct an empty deque
public boolean isEmpty() // is the deque empty?
public int size() // return the number of items on the deque
public void addFirst(Item item) // add the item to the front
public void addLast(Item item) // add the item to the end
public Item removeFirst() // remove and return the item from the front
public Item removeLast() // remove and return the item from the end
public Iterator<Item> iterator() // return an iterator over items in order from front to end
public static void main(String[] args) // unit testing (optional)
}