Is Executor shutdown blocking?

Is Executor shutdown blocking?

After 15 seconds, we shut down the executor but does not block the program execution as print statements gets executed. At this moment, only one task has been completed. Once we call awaitTermination() , it blocks the execution now wait until all tasks are finished.

What happens to a thread when it finishes Java?

Once the thread completes, it will go to dead state getting ready to be garbage collected by the JVM. unless some other “live” data structure maintains a reference to the thread object.

How do you wait for all futures to complete?


  1. Wait for List of CompletableFuture.
  2. Waiting on multiple threads to complete in Java.
  3. Wait for every Future in a List to be done.
  4. Most efficient way to stream on list of Futures.
  5. Join a group of threads with overall timeout.
  6. Call method after each cycle of ScheduledExecutorService.

How can we invoke all waiting threads?

Waiting threads to finish completely in Java

  1. Using join() method of Thread class.
  2. Using CountDownLatch.
  3. Using shutdown(), isTerminated() methods of Executors.
  4. Using invokeAll() method of ExecutorService.
  5. Using invokeAll() method of ExecutorCompletionService.

How do you cancel an Executor of a will?

To properly shut down an ExecutorService, we have the shutdown() and shutdownNow() APIs. The shutdown() method doesn’t cause immediate destruction of the ExecutorService. It will make the ExecutorService stop accepting new tasks and shut down after all running threads finish their current work: executorService.

How do I interrupt ExecutorService?


  1. If using Thread directly in your code, you may call interrupt() on the instance of thread.
  2. If using Executor framework, you may cancel each task by calling cancel() on Future.
  3. If using Executor framework, you may shutdown the ExecutorService by calling the shutdownNow() method.

What is life cycle of a thread in Java?

Life Cycle of Thread in Java is basically state transitions of a thread that starts from its birth and ends on its death. When an instance of a thread is created and is executed by calling start() method of Thread class, the thread goes into runnable state.

What is the life cycle of a thread?

It is also referred to as a born thread. Runnable − After a newly born thread is started, the thread becomes runnable. A thread in this state is considered to be executing its task. Waiting − Sometimes, a thread transitions to the waiting state while the thread waits for another thread to perform a task.