Collecting Objects - Beginning Java 7 - page 480

Runthisapplicationandyouwillnowseeasingleoutputlineof15integersshownin
descending numerical order from left to right. For example, I observed this output line:
90 86 78 74 65 53 45 44 30 28 18 9 9 7 5
Deque
A deque (pronounceddeck)isadouble-endedqueueinwhichelement insertionorre-
moval occurs at its head or tail. Deques can be used as queues or stacks.
Deque , whose generic type is Deque<E> , extends Queue , in which the inherited
add(E e) method inserts e at the deque's tail. Table 5-6 describes Deque -specific
methods.