Immediately performs the base action of this task and returns
true if, upon return from this method, this task is guaranteed
to have completed normally. This method may return false
otherwise, to indicate that this task is not necessarily
complete (or is not known to be complete), for example in
asynchronous actions that require explicit invocations of
completion methods. This method may also throw an (unchecked)
exception to indicate abnormal exit. This method is designed to
support extensions, and should not in general be called
otherwise.
@return {@code true} if this task is known to have completed normally
Immediately performs the base action of this task and returns true if, upon return from this method, this task is guaranteed to have completed normally. This method may return false otherwise, to indicate that this task is not necessarily complete (or is not known to be complete), for example in asynchronous actions that require explicit invocations of completion methods. This method may also throw an (unchecked) exception to indicate abnormal exit. This method is designed to support extensions, and should not in general be called otherwise.
@return {@code true} if this task is known to have completed normally