Enqueue 1, 2, 3, 4, 5 --------------------- Contents: 1 Contents: 1 2 Contents: 1 2 3 Contents: 1 2 3 4 Contents: 1 2 3 4 5 Dequeue one item ---------------- Contents: 2 3 4 5 Deque all items --------------- Item dequeued: 2 Contents: 3 4 5 Item dequeued: 3 Contents: 4 5 Item dequeued: 4 Contents: 5 Item dequeued: 5 Contents: 10, 11, 12, 13, 14, 15 enqueued ------------------------------- Contents: 10 11 12 13 14 15