Callable

  • Callable is an interface defining a single method call() for tasks that return a result and may throw an exception.

  • It is similar to Runnable, but allows for returning a result and throwing checked exceptions, suitable for execution by another thread.

  • The Executors class provides methods to convert other forms into Callable classes.

  • The call() method is responsible for computing a result and potentially throwing an exception if computation fails.
public interface Callable

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.

See Also

Public Method Summary

abstract V
call()
Computes a result, or throws an exception if unable to do so.

Public Methods

public abstract V call ()

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

Returns
  • computed result
Throws
Exception if unable to compute a result