Returns a Callable object that, when called, runs the given task and returns the given result. This can be useful when applying methods requiring a Callable to an otherwise resultless action.

task	the task to run
result	the result to return
return	a callable object
Throws	NullPointerException: if task null

Returns a Callable object that, when called, runs the given task and returns null.

task	the task to run
return	a callable object
Throws	NullPointerException: if task null

Returns a Callable object that, when called, runs the given privileged action and returns its result.

action	the privileged action to run
return	a callable object
Throws	NullPointerException: if action null

Returns a Callable object that, when called, runs the given privileged exception action and returns its result.

action	the privileged exception action to run
return	a callable object
Throws	NullPointerException: if action null

Returns a default thread factory used to create new threads. This factory creates all new threads used by an Executor in the same ThreadGroup. If there is a java.lang.SecurityManager, it uses the group of System#getSecurityManager, else the group of the thread invoking this defaultThreadFactory method. Each new thread is created as a non-daemon thread with priority set to the smaller of Thread.NORM_PRIORITY and the maximum priority permitted in the thread group. New threads have names accessible via Thread#getName of pool-N-thread-M, where N is the sequence number of this factory, and M is the sequence number of the thread created by this factory.

return

a thread factory

Creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available. These pools will typically improve the performance of programs that execute many short-lived asynchronous tasks. Calls to execute will reuse previously constructed threads if available. If no existing thread is available, a new thread will be created and added to the pool. Threads that have not been used for sixty seconds are terminated and removed from the cache. Thus, a pool that remains idle for long enough will not consume any resources. Note that pools with similar properties but different details (for example, timeout parameters) may be created using ThreadPoolExecutor constructors.

return

the newly created thread pool

Creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available, and uses the provided ThreadFactory to create new threads when needed.

threadFactory	the factory to use when creating new threads
return	the newly created thread pool
Throws	NullPointerException: if threadFactory is null

Creates a thread pool that reuses a fixed number of threads operating off a shared unbounded queue. At any point, at most nThreads threads will be active processing tasks. If additional tasks are submitted when all threads are active, they will wait in the queue until a thread is available. If any thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks. The threads in the pool will exist until it is explicitly shutdown.

nThreads	the number of threads in the pool
return	the newly created thread pool
Throws	IllegalArgumentException: if nThreads <= 0

Creates a thread pool that reuses a fixed number of threads operating off a shared unbounded queue, using the provided ThreadFactory to create new threads when needed. At any point, at most nThreads threads will be active processing tasks. If additional tasks are submitted when all threads are active, they will wait in the queue until a thread is available. If any thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks. The threads in the pool will exist until it is explicitly shutdown.

nThreads	the number of threads in the pool
threadFactory	the factory to use when creating new threads
return	the newly created thread pool
Throws	NullPointerException: if threadFactory is null
Throws	IllegalArgumentException: if nThreads <= 0

Creates a thread pool that can schedule commands to run after a given delay, or to execute periodically.

corePoolSize	the number of threads to keep in the pool, even if they are idle.
return	a newly created scheduled thread pool
Throws	IllegalArgumentException: if corePoolSize < 0

Creates a thread pool that can schedule commands to run after a given delay, or to execute periodically.

corePoolSize	the number of threads to keep in the pool, even if they are idle.
threadFactory	the factory to use when the executor creates a new thread.
return	a newly created scheduled thread pool
Throws	IllegalArgumentException: if corePoolSize < 0
Throws	NullPointerException: if threadFactory is null

Creates an Executor that uses a single worker thread operating off an unbounded queue. (Note however that if this single thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks.) Tasks are guaranteed to execute sequentially, and no more than one task will be active at any given time. Unlike the otherwise equivalent newFixedThreadPool(1) the returned executor is guaranteed not to be reconfigurable to use additional threads.

return

the newly created single-threaded Executor

Creates an Executor that uses a single worker thread operating off an unbounded queue, and uses the provided ThreadFactory to create a new thread when needed. Unlike the otherwise equivalent newFixedThreadPool(1, threadFactory) the returned executor is guaranteed not to be reconfigurable to use additional threads.

threadFactory	the factory to use when creating new threads
return	the newly created single-threaded Executor
Throws	NullPointerException: if threadFactory is null

Creates a single-threaded executor that can schedule commands to run after a given delay, or to execute periodically. (Note however that if this single thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks.) Tasks are guaranteed to execute sequentially, and no more than one task will be active at any given time. Unlike the otherwise equivalent newScheduledThreadPool(1) the returned executor is guaranteed not to be reconfigurable to use additional threads.

return

the newly created scheduled executor

Creates a single-threaded executor that can schedule commands to run after a given delay, or to execute periodically. (Note however that if this single thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks.) Tasks are guaranteed to execute sequentially, and no more than one task will be active at any given time. Unlike the otherwise equivalent newScheduledThreadPool(1, threadFactory) the returned executor is guaranteed not to be reconfigurable to use additional threads.

threadFactory	the factory to use when creating new threads
return	a newly created scheduled executor
Throws	NullPointerException: if threadFactory is null

Returns a Callable object that will, when called, execute the given callable under the current access control context. This method should normally be invoked within an AccessController#doPrivileged action to create callables that will, if possible, execute under the selected permission settings holding within that action; or if not possible, throw an associated AccessControlException.

callable	the underlying task
return	a callable object
Throws	NullPointerException: if callable null

Returns a Callable object that will, when called, execute the given callable under the current access control context, with the current context class loader as the context class loader. This method should normally be invoked within an AccessController#doPrivileged action to create callables that will, if possible, execute under the selected permission settings holding within that action; or if not possible, throw an associated AccessControlException.

callable	the underlying task
return	a callable object
Throws	NullPointerException: if callable null
Throws	AccessControlException: if the current access control context does not have permission to both set and get context class loader.

Returns a thread factory used to create new threads that have the same permissions as the current thread. This factory creates threads with the same settings as Executors#defaultThreadFactory, additionally setting the AccessControlContext and contextClassLoader of new threads to be the same as the thread invoking this privilegedThreadFactory method. A new privilegedThreadFactory can be created within an AccessController#doPrivileged action setting the current thread's access control context to create threads with the selected permission settings holding within that action.

Note that while tasks running within such threads will have the same access control and class loader settings as the current thread, they need not have the same java.lang.ThreadLocal or java.lang.InheritableThreadLocal values. If necessary, particular values of thread locals can be set or reset before any task runs in ThreadPoolExecutor subclasses using ThreadPoolExecutor#beforeExecute. Also, if it is necessary to initialize worker threads to have the same InheritableThreadLocal settings as some other designated thread, you can create a custom ThreadFactory in which that thread waits for and services requests to create others that will inherit its values.

return	a thread factory
Throws	AccessControlException: if the current access control context does not have permission to both get and set context class loader.

Returns an object that delegates all defined ExecutorService methods to the given executor, but not any other methods that might otherwise be accessible using casts. This provides a way to safely "freeze" configuration and disallow tuning of a given concrete implementation.

executor	the underlying implementation
return	an ExecutorService instance
Throws	NullPointerException: if executor null

Returns an object that delegates all defined ScheduledExecutorService methods to the given executor, but not any other methods that might otherwise be accessible using casts. This provides a way to safely "freeze" configuration and disallow tuning of a given concrete implementation.

executor	the underlying implementation
return	a ScheduledExecutorService instance
Throws	NullPointerException: if executor null