| Package | Description | 
|---|---|
| java.util.concurrent | Utility classes commonly useful in concurrent programming. | 
| Modifier and Type | Interface and Description | 
|---|---|
| interface  | BlockingDeque<E>A  Dequethat additionally supports blocking operations that wait
 for the deque to become non-empty when retrieving an element, and wait for
 space to become available in the deque when storing an element. | 
| interface  | TransferQueue<E>A  BlockingQueuein which producers may wait for consumers
 to receive elements. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ArrayBlockingQueue<E>A bounded blocking queue backed by an
 array. | 
| class  | DelayQueue<E extends Delayed>An unbounded blocking queue of
  Delayedelements, in which an element can only be taken
 when its delay has expired. | 
| class  | LinkedBlockingDeque<E>An optionally-bounded blocking deque based on
 linked nodes. | 
| class  | LinkedBlockingQueue<E>An optionally-bounded blocking queue based on
 linked nodes. | 
| class  | LinkedTransferQueue<E>An unbounded  TransferQueuebased on linked nodes. | 
| class  | PriorityBlockingQueue<E>An unbounded blocking queue that uses
 the same ordering rules as class  PriorityQueueand supplies
 blocking retrieval operations. | 
| class  | SynchronousQueue<E>A blocking queue in which each insert
 operation must wait for a corresponding remove operation by another
 thread, and vice versa. | 
| Modifier and Type | Method and Description | 
|---|---|
| BlockingQueue<Runnable> | ThreadPoolExecutor. getQueue()Returns the task queue used by this executor. | 
| BlockingQueue<Runnable> | ScheduledThreadPoolExecutor. getQueue()Returns the task queue used by this executor. | 
| Constructor and Description | 
|---|
| ExecutorCompletionService(Executor executor,
                         BlockingQueue<Future<V>> completionQueue)Creates an ExecutorCompletionService using the supplied
 executor for base task execution and the supplied queue as its
 completion queue. | 
| ThreadPoolExecutor(int corePoolSize,
                  int maximumPoolSize,
                  long keepAliveTime,
                  TimeUnit unit,
                  BlockingQueue<Runnable> workQueue)Creates a new  ThreadPoolExecutorwith the given initial
 parameters and default thread factory and rejected execution handler. | 
| ThreadPoolExecutor(int corePoolSize,
                  int maximumPoolSize,
                  long keepAliveTime,
                  TimeUnit unit,
                  BlockingQueue<Runnable> workQueue,
                  RejectedExecutionHandler handler)Creates a new  ThreadPoolExecutorwith the given initial
 parameters and default thread factory. | 
| ThreadPoolExecutor(int corePoolSize,
                  int maximumPoolSize,
                  long keepAliveTime,
                  TimeUnit unit,
                  BlockingQueue<Runnable> workQueue,
                  ThreadFactory threadFactory)Creates a new  ThreadPoolExecutorwith the given initial
 parameters and default rejected execution handler. | 
| ThreadPoolExecutor(int corePoolSize,
                  int maximumPoolSize,
                  long keepAliveTime,
                  TimeUnit unit,
                  BlockingQueue<Runnable> workQueue,
                  ThreadFactory threadFactory,
                  RejectedExecutionHandler handler)Creates a new  ThreadPoolExecutorwith the given initial
 parameters. | 
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