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dl |
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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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package java.util.concurrent; |
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/** |
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* A task that returns a result and may throw an exception. |
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* Implementors define a single method with no arguments called |
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* <tt>call</tt>. |
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* |
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* <p>The <tt>Callable</tt> interface is similar to {@link |
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* java.lang.Runnable}, in that both are designed for classes whose |
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* instances are potentially executed by another thread. A |
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* <tt>Runnable</tt>, however, does not return a result and cannot |
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* throw a checked exception. |
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* |
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* <p>The {@link Executors} class contains utility methods to |
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* convert from other common forms to <tt>Callable</tt> classes. |
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* |
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* @see Executor |
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* @since 1.5 |
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* @author Doug Lea |
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* @param <V> the result type of method <tt>call</tt> |
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*/ |
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public interface Callable<V> { |
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/** |
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* Computes a result, or throws an exception if unable to do so. |
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* |
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* @return computed result |
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* @throws Exception if unable to compute a result |
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*/ |
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V call() throws Exception; |
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} |
