### Question:
LinkedQueue implements Queue<E> { @Override public void enqueue(E e) { }  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 testEnqueue() { LinkedQueue<Integer> s = new LinkedQueue<>(); for(int i = 0; i < 10; ++i) s.enqueue(i); assertEquals("[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]", s.toString()); }