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package java.util.concurrent;

/**
 * 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 {@link
 * java.lang.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 {@link Executors} class contains utility methods to
 * convert from other common forms to Callable classes.
 *
 * @see Executor
 * @since 1.5
 * @author Doug Lea
 * @param  the result type of method call
 */
public interface Callable {
    /**
     * Computes a result, or throws an exception if unable to do so.
     *
     * @return computed result
     * @throws Exception if unable to compute a result
     */
    V call() throws Exception;
}