java.util.concurrent
Interface Callable<V>

Type Parameters:

V - the result type of method call

public interface Callable<V>

A task that returns a result and may throw an exception. Implementors define a single method with no arguments called 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.

Since:

1.5

See Also:

Executor , FutureTask

call

V call()
       throws Exception

Computes a result, or throws an exception if unable to do so.

Returns:

computed result

Throws:

Exception - if unable to compute a result