void addAll(
Iterable<E> iterable
)

Adds all elements of iterable at the end of the queue. The length of the queue is extended by the length of iterable.

Source

/**
 * Adds all elements of [iterable] at the end of the queue. The
 * length of the queue is extended by the length of [iterable].
 */
void addAll(Iterable<E> iterable);