/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain. Use, modify, and
 * redistribute this code in any way without acknowledgement.
 */

package java.util.concurrent;

/**
 * A task that returns a result and may throw an exception.
 * Implementors define a single method with no arguments called
 * <tt>call</tt>.
 *
 * <p>The <tt>Callable</tt> interface is similar to {@link Runnable},
 * in that both are designed for classes whose instances are
 * potentially executed by another thread.  A <tt>Runnable</tt>,
 * however, does not return a result and cannot throw a checked
 * exception.
 *

 * @since 1.5
 * @see Executor
 * @see FutureTask
 *
 * @spec JSR-166
 * @revised $Date: 2003/06/24 14:34:47 $
 * @editor $Author: dl $
 * @author Doug Lea
 */
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;
}