cancel
boolean cancel(boolean mayInterruptIfRunning)
Cancels the running task.
Attempts to cancel execution of this task. This attempt will fail if the
task has already completed, already been cancelled, or could not be
cancelled for some other reason. If successful, and this task has not
started when cancel is called, this task should never run. If the task
has already started, then the mayInterruptIfRunning parameter determines
whether the thread executing this task should be interrupted in an
attempt to stop the task.
- Parameters:
mayInterruptIfRunning
- true if the thread executing this task should be interrupted;
otherwise, in-progress tasks are allowed to complete
- Returns:
- false if the task could not be cancelled, typically because it
has already completed normally; true otherwise