小编chk*_*ddi的帖子

我创建了一个DeQueue作为follws

Deque<Integer> deque = new ArrayDeque<Integer>(8);

// use add() method to add elements in the deque
deque.add(20);
deque.add(30);
deque.addLast(12);
deque.add(18);        
deque.addFirst(22);
deque.add(24);

// let us print all the elements available in deque
for (Integer number : deque) {
    System.out.println("Number = " + number);
}

预期的产出是:

Number = 22
Number = 20
Number = 30
Number = 18
Number = 24
Number = 12

但实际输出是:

Number = 22
Number = 20
Number = 30
Number = 12
Number = 18
Number …