| 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
  Delayedelements, in which an element can only be taken
 when its delay has expired. | 
| Modifier and Type | Interface and Description | 
|---|---|
| interface  | RunnableScheduledFuture<V>A  ScheduledFuturethat isRunnable. | 
| interface  | ScheduledFuture<V>A delayed result-bearing action that can be cancelled. | 
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