An unbounded blocking queue of
Delayed elements, in which an element can only be taken
when its delay has expired. The head of the queue is that
Delayed element whose delay expired furthest in the
past. If no delay has expired there is no head and poll
will return null. Expiration occurs when an element's
getDelay(TimeUnit.NANOSECONDS) method returns a value less
than or equal to zero. Even though unexpired elements cannot be
removed using take or poll, they are otherwise
treated as normal elements. For example, the size method
returns the count of both expired and unexpired elements.
This queue does not permit null elements.
This class and its iterator implement all of the optional
methods of the Collection and Iterator interfaces.
The Iterator provided in method iterator() is not
guaranteed to traverse the elements of the DelayQueue in any
particular order.
This class is a member of the Java Collections Framework.
extends
<E> | the type of elements held in this queue |