class EmptyQueueE extends Exception{} public class Queue { private DoublyLinkedList q; private int size; // TODO: default constructor public Queue(){ } // TODO: Put element at end of queue public void enqueue(E elem){ } // TODO: Return the head of the queue; If there's nothing to return then throw EmptyQueueE public E dequeue() throws EmptyQueueE { return null; } // TODO: Without affecting the queue, return the element at the top of the queue public E peek() throws IndexOutOfBoundsException{ return null; } public int size() { return this.size; } // TODO: Checks if inputted is the same Queue public boolean equals(Object o){ return false; } public String toString(){ return "" + q.size(); } }