Home » Oracle » 1z0-804 » Which type of ExecutorService supports the execution of tasks after a fixed delay?
Which type of ExecutorService supports the execution of tasks after a fixed delay?
A. DelayedExecutorService
B. ScheduledExecutorService
C. TimedExecutorService
D. FixedExecutorService
E. FutureExecutorService
Correct Answer: B
Explanation/Reference:
Explanation:
The ScheduledExecutorService interface supplements the methods of its parent ExecutorService with schedule, which executes a Runnable or Callable task after a specified delay. In addition, the interface defines scheduleAtFixedRate and scheduleWithFixedDelay, which executes specified tasks repeatedly, at defined intervals.
Note:The java.util.concurrent package defines three executor interfaces:
*Executor, a simple interface that supports launching new tasks. *ExecutorService, a subinterface of Executor, which adds features that help manage the lifecycle, both of the individual tasks and of the executor itself.
*ScheduledExecutorService, a subinterface of ExecutorService, supports future and/or periodic execution of tasks.
Reference: The Java Tutorials,Executor Interfaces
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