void function ( ) { }
subclasses can override this method to implement interruption of the future 's computation . the method is invoked automatically by a successful call to #cancel boolean cancel true . the default implementation does nothing . concode_field_sep boolean cancelled concode_elem_sep AtomicReference<Object> value concode_elem_sep SettableTask<T> settableTask concode_elem_sep Object NO_VALUE concode_elem_sep ListenableFutureTask<T> listenableFuture concode_field_sep boolean cancel concode_elem_sep T call concode_elem_sep boolean isCancelled concode_elem_sep boolean set concode_elem_sep void setCancelled concode_elem_sep T get concode_elem_sep T get concode_elem_sep boolean setValue concode_elem_sep boolean setException concode_elem_sep boolean setException concode_elem_sep boolean isDone concode_elem_sep void addCallback concode_elem_sep void addCallback