Java Executors.newVirtualThreadPerTaskExecutor() Example
Added in Java 21, the Executors.newVirtualThreadPerTaskExecutor() method returns an Executor that creates a new virtual thread for each task submitted to it.
Java – Waiting for Running Threads to Finish
Learn to make the main thread wait for other threads to finish using the ExecutorService or ThreadPoolExecutor methods and CountDownLatch.
Java ExecutorService Shutdown: shutdown() vs shutdownNow()
Shut down a Java ExecutorService with shutdown(), awaitTermination() and shutdownNow(), or with try-with-resources and close() on Java 19+. Covers queued tasks, RejectedExecutionException, virtual threads, JVM exit and shutdown hooks.
How to Cancel a Task in Java ExecutorService
Learn to cancel a task submitted to an executor service that still has to be executed not completed yet using Future.cancel() API.
Java ScheduledExecutorService with Examples
Learn to execute a task after a period of time or execute it periodically using ScheduledExecutorService class in Java using ScheduledThreadPoolExecutor.
Java ExecutorService invokeAll()
Learn to run multiple Callable tasks with ExecutorService.invokeAll(tasks) API and processing all the results returned from tasks in form of Future class instances in this ExecutorService Callable example.
ExecutorService invokeAny()
Learn to use ExecutorService invokeAny() method where we execute multiple tasks at same time, but we make a decision asap any one of tasks is completed.
RejectedExecutionHandler in Java: Policies and Examples
A RejectedExecutionHandler decides what happens to a task that a ThreadPoolExecutor cannot accept. Compare the four built-in policies with real output and write custom handlers.
Guide to ExecutorService in Java
Learn to use Java ExecutorService to execute a Runnable or Callable class in an asynchronous way. Also learn the various best practices to utilize it in most efficient manner in any Java application.
Java Fixed Size Thread Pool Executor Example
In previous tutorial, we learned about basic thread pool executor with unlimited possible number of threads into the pool and it’s example usage. Now lets look example of fixed size thread pool executor which will help in improved performance and better system resource utilization by limiting the maximum number of …
Java Thread Pools and ThreadPoolExecutor
Why do we need a thread pool in Java? The answer is when we develop a simple, concurrent application in Java, we create some Runnable objects and then create the corresponding Thread objects to execute them. Creating a thread in Java is an expensive operation. And if you start creating …
Throttling Task Submission Rate in Java
1. Introduction In BlockingQueue and ThreadPoolExecutor example, we learned creating a CustomThreadPoolExecutor which had the following capabilities: Tasks are being submitted to the blocking queue. An executor picks up the task from the queue and execute them. It had overridden beforeExecute() and afterExecute() methods to perform pre-and-post activities if needed. …
Java ThreadPoolExecutor with BlockingQueue
Java ThreadPoolExecutor & BlockingQueue example to run a demo task with fixed size thread pool. Also, learn to use RejectedExecutionHandler.