| Package | Description | 
|---|---|
| java.util.concurrent | 
 Utility classes commonly useful in concurrent programming. 
 | 
| Modifier and Type | Class and Description | 
|---|---|
class  | 
DelayQueue<E extends Delayed>
An unbounded blocking queue of
  
Delayed elements, in which an element can only be taken
 when its delay has expired. | 
| Modifier and Type | Interface and Description | 
|---|---|
interface  | 
RunnableScheduledFuture<V>
A  
ScheduledFuture that is Runnable. | 
interface  | 
ScheduledFuture<V>
A delayed result-bearing action that can be cancelled. 
 | 
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