Implementing an LinkedQueue class in java

Problem:

Write a program that implements an LinkedQueue in java.

Output:

Not available.

Solution:

public class LinkedQueue<E> implements Queue<E> {
private Node<E> head = new Node<E>(); // dummy node
private int size;

public void add(E element) {
head.prev = head.prev.next = new Node<E>(element, head.prev, head);
++size;
}

public E element() {
if (size == 0) {
throw new java.util.EmptyStackException();
}
return head.next.element; // front of queue // next <--> prev
}
public boolean isEmpty() {
return (size == 0);
}

public E remove() {
if (size == 0) {
throw new java.util.EmptyStackException();
}
E element = head.next.element; // next <--> prev
head.next = head.next.next; // next <--> prev
head.next.prev = head; // next <--> prev
--size;
return element;
}
public int size() {
return size;
}
private static class Node<E> {
E element;
Node<E> prev;
Node<E> next;
Node() {
this.prev = this.next = this;
}
Node(E element, Node<E> prev, Node<E> next) {
this.element = element;
this.prev = prev;
this.next = next;
}
}
}