Commences performing this task, awaits its completion if necessary, and returns its result, or throws an (unchecked) {@code RuntimeException} or {@code Error} if the underlying computation did so.
@return the computed result
See Implementation
Commences performing this task, awaits its completion if necessary, and returns its result, or throws an (unchecked) {@code RuntimeException} or {@code Error} if the underlying computation did so.
@return the computed result