/*

* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.

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/*

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* Written by Doug Lea with assistance from members of JCP JSR-166

* Expert Group and released to the public domain, as explained at

* http://creativecommons.org/publicdomain/zero/1.0/

*/

package java.util.concurrent;

/**

* A task that returns a result and may throw an exception.

* Implementors define a single method with no arguments called

* {@code call}.

*

* <p>The {@code 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

* {@code Runnable}, however, does not return a result and cannot

* throw a checked exception.

*

* <p>The {@link Executors} class contains utility methods to

* convert from other common forms to {@code Callable} classes.

*

* @see Executor

* @since 1.5

* @author Doug Lea

* @param <V> the result type of method {@code call}

*/

@FunctionalInterface

public interface Callable<V> {

/**

* 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;

}