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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)
}

public class Deque<Item> implements Iterable<Item> {

    // construct an empty deque
    public Deque()

    // is the deque empty?
    public boolean isEmpty()

    // return the number of items on the deque
    public int size()

    // add the item to the front
    public void addFirst(Item item)

    // add the item to the back
    public void addLast(Item item)

    // remove and return the item from the front
    public Item removeFirst()

    // remove and return the item from the back
    public Item removeLast()

    // return an iterator over items in order from front to back
    public Iterator<Item> iterator()

    // unit testing (required)
    public static void main(String[] args)

}