### Question:
LinkedQueue implements Queue<E> { @Override public E dequeue() { return null; }  static void main(String[] args); @Override int size(); @Override boolean isEmpty(); @Override void enqueue(E e); @Override E first(); @Override E dequeue();  }### Answer:
@Test void testDequeue() { LinkedQueue<Integer> s = new LinkedQueue<>(); for(int i = 0; i < 10; ++i) s.enqueue(i); assertEquals(0, s.dequeue()); assertEquals(9, s.size()); }