Java Multithreading and Parallel Programming Masterclass - Scheduling Tasks with ScheduledThreadPoolExecutor

The lecture introduces the Scheduled Thread Pool Executor in Java, explaining its purpose and how it extends the Thread Pool Executor class. It covers constructors, queue details, and methods for scheduling tasks, including schedule and scheduleAtFixedRate. Additional functionalities like task cancellation and shutdown policies are also discussed, providing a comprehensive understanding of how to use this executor for scheduling tasks in Java applications.

What is the primary purpose of the Scheduled Thread Pool Executor in Java?

• To execute tasks immediately without delay

• To handle exceptions in threads

• To run tasks on a scheduled basis

• To manage memory allocation

Which of the following is a characteristic of the delayed work queue used in the Scheduled Thread Pool Executor?

• It is a bounded queue

• It is an unbounded queue

• It has a fixed capacity

• It uses a stack data structure

What happens if too many tasks are added to the Scheduled Thread Pool Executor?

• The tasks are automatically removed

• The memory may fill up

• The tasks are executed immediately

• The tasks are ignored

How does the 'schedule' method in the Scheduled Thread Pool Executor work?

• It runs a task after a specified delay

• It runs a task at a fixed rate

• It cancels a task

• It runs a task immediately

What is the difference between 'schedule' and 'scheduleAtFixedRate' methods?

• 'schedule' runs tasks periodically, 'scheduleAtFixedRate' runs once

• Both methods are used for task cancellation

• 'schedule' runs once after a delay, 'scheduleAtFixedRate' runs periodically

• Both methods run tasks immediately

What does the 'setRemoveOnCancelPolicy' method do?

• It adds tasks to the queue

• It increases the queue capacity

• It removes tasks from the queue when cancelled

• It schedules tasks at a fixed rate

Which method ensures that delayed tasks are executed after shutdown?

• shutdownNow

• scheduleAtFixedRate

• setRemoveOnCancelPolicy

• setExecuteExistingDelayedTasksAfterShutdownPolicy