A cancellable asynchronous computation. This class provides a base implementation of
, with methods to start and cancel a computation, query to see if the computation is complete, and retrieve the result of the computation. The result can only be retrieved when the computation has completed; the
methods will block if the computation has not yet completed. Once the computation has completed, the computation cannot be restarted or cancelled (unless the computation is invoked using
FutureTask can be used to wrap a
Runnable object. Because
FutureTask can be submitted to an
Executor for execution.
In addition to serving as a standalone class, this class provides
protected functionality that may be useful when creating customized task classes.