printContents();
$queue->enqueue("Ivan", "Ljubicic", 3);
$queue->printContents();
$queue->enqueue("Roger", "Federer", 1);
$queue->printContents();
$queue->enqueue("Rafael", "Nadal", 2);
$queue->printContents();
$queue->enqueue("David", "Nalbandian", 4);
$queue->printContents();
$queue->enqueue("Mario", "Ancic", 5);
$queue->printContents();
$queue->dequeue();
$queue->printContents();
$queue->dequeue();
$queue->printContents();
$queue->makeEmpty();
$queue->printContents();
$queue->enqueue("Amelie", "Mauresmo", 1);
$queue->printContents();
$queue->enqueue("Kim", "Clijsters", 2);
$queue->printContents();
$queue->dequeue();
$queue->printContents();
$queue->dequeue();
$queue->printContents();
$queue->dequeue();
$queue->printContents();
?>