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
#	Content
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	}