从 Deque 中删除元素

Created: November-22, 2018

//Retrieves and removes the head of the queue represented by this deque
Object headItem = deque.remove();

//Retrieves and removes the first element of this deque.
Object firstItem = deque.removeFirst();

//Retrieves and removes the last element of this deque.
Object lastItem = deque.removeLast();