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