... interface. Using composition enables us to hide class List<E>
’s other public
methods from Queue<E>
’s client code. Each Queue<E>
method delegates to a List<E>
method—enqueue
calls List<E>
method insertAtBack
(Fig. 21.11, line 14), dequeue
calls List<E>
method removeFromFront
(line 18), isEmpty
calls List<E>
method isEmpty
(line 22) and print
calls List<E>
method print
(line 25). For reuse, class Queue<E>
is declared in package com.deitel.datastructures
. Again, we do not import List<E>
because it’s in the same package.
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