util/concurrent/Callable.java

/*
 * 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;
}
Revision:	1.1
Committed:	Sat Mar 26 06:22:49 2016 UTC (8 years, 1 month ago) by jsr166
Branch:	MAIN
CVS Tags:	HEAD
Log Message:	fork jdk8 maintenance branch for source and jtreg tests
#	User	Rev	Content
1	jsr166	1.1	/*
2			* Written by Doug Lea with assistance from members of JCP JSR-166
3			* Expert Group and released to the public domain, as explained at
4			* http://creativecommons.org/publicdomain/zero/1.0/
5			*/
6
7			package java.util.concurrent;
8
9			/**
10			* A task that returns a result and may throw an exception.
11			* Implementors define a single method with no arguments called
12			* {@code call}.
13			*
14			* <p>The {@code Callable} interface is similar to {@link
15			* java.lang.Runnable}, in that both are designed for classes whose
16			* instances are potentially executed by another thread. A
17			* {@code Runnable}, however, does not return a result and cannot
18			* throw a checked exception.
19			*
20			* <p>The {@link Executors} class contains utility methods to
21			* convert from other common forms to {@code Callable} classes.
22			*
23			* @see Executor
24			* @since 1.5
25			* @author Doug Lea
26			* @param <V> the result type of method {@code call}
27			*/
28			@FunctionalInterface
29			public interface Callable<V> {
30			/**
31			* Computes a result, or throws an exception if unable to do so.
32			*
33			* @return computed result
34			* @throws Exception if unable to compute a result
35			*/
36			V call() throws Exception;
37			}