V - the result type of method call@FunctionalInterface public interface Callable<V>
call.
 The Callable interface is similar to Runnable, in that both are designed for classes whose
 instances are potentially executed by another thread.  A
 Runnable, however, does not return a result and cannot
 throw a checked exception.
 
The Executors class contains utility methods to
 convert from other common forms to Callable classes.
Executor| Modifier and Type | Method and Description | 
|---|---|
| V | call()Computes a result, or throws an exception if unable to do so. | 
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