java.util.concurrent.Callable

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/**
 * 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;

}

Callable 和 Runnable 的使用方法大同小异， 区别在于： 
1.Callable 使用 call（） 方法， Runnable 使用 run() 方法 
2.call() 可以返回值， 而 run()方法不能返回。 
3.call() 可以抛出受检查的异常，比如ClassNotFoundException， 而run()不能抛出受检查的异常。 

java.util.concurrent.Callable

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原文地址：http://my.oschina.net/Rayn/blog/497285