Returns {@code true} if this task completed.
Completion may be due to normal termination, an exception, or cancellation -- in all of these cases, this method will return {@code true}.
@return {@code true} if this task completed
See Implementation
Returns {@code true} if this task completed.
Completion may be due to normal termination, an exception, or cancellation -- in all of these cases, this method will return {@code true}.
@return {@code true} if this task completed