### Question:
LinkedQueue implements Queue<E> { @Override public int size() { return 0; }  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 testSize() { LinkedQueue<Integer> s = new LinkedQueue<>(); for(int i = 0; i < 10; ++i) s.enqueue(i); assertEquals(10, s.size()); }