# Uses of Class
java.util.concurrent.ThreadPoolExecutor

Packages that use ThreadPoolExecutor
Package
Description
java.util.concurrent
Utility classes commonly useful in concurrent programming.

## Uses of ThreadPoolExecutor in java.util.concurrent

Subclasses of ThreadPoolExecutor in java.util.concurrent
Modifier and Type
Class
Description
`class`
`ScheduledThreadPoolExecutor`
A `ThreadPoolExecutor` that can additionally schedule commands to run after a given delay, or to execute periodically.
Methods in java.util.concurrent with parameters of type ThreadPoolExecutor
Modifier and Type
Method
Description
`void`
RejectedExecutionHandler.`rejectedExecution(Runnable r, ThreadPoolExecutor executor)`
Method that may be invoked by a `ThreadPoolExecutor` when `execute` cannot accept a task.
`void`
ThreadPoolExecutor.AbortPolicy.`rejectedExecution(Runnable r, ThreadPoolExecutor e)`
Always throws RejectedExecutionException.
`void`
ThreadPoolExecutor.CallerRunsPolicy.`rejectedExecution(Runnable r, ThreadPoolExecutor e)`
Executes task r in the caller's thread, unless the executor has been shut down, in which case the task is discarded.
`void`
ThreadPoolExecutor.DiscardOldestPolicy.`rejectedExecution(Runnable r, ThreadPoolExecutor e)`
Obtains and ignores the next task that the executor would otherwise execute, if one is immediately available, and then retries execution of task r, unless the executor is shut down, in which case task r is instead discarded.
`void`
ThreadPoolExecutor.DiscardPolicy.`rejectedExecution(Runnable r, ThreadPoolExecutor e)`
Does nothing, which has the effect of discarding task r.