ExecutorService的submit和execute的区别

最新推荐文章于 2025-07-24 13:33:27 发布

原创最新推荐文章于 2025-07-24 13:33:27 发布 · 915 阅读

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#Java #ExecutorService

本文解析了Java中ExecutorService接口的submit和execute方法的区别。submit方法可返回Future对象，支持有返回值的任务，而execute仅执行任务无返回。深入探讨了两者在任务调度和执行模式上的差异。

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昨天写代码的时候，业务线老大帮我review代码的时候，突然问我ExecutorService的submit和execute的区别，当时就懵了，突然问到我了，之前看到这个代码，直接就是copy的，其实都没有深究，“我有罪，我反省“，我不能成为一个ctrl C,ctrl V都程序员，所以这篇就简单介绍下两者都区别，有不对的地方，见者可以积极指出，感谢～

1.咱们可以看到，ExecutorService继承于Executor,

-看下submit在ExecutorService的定义，定义了3个

/**
     * Submits a value-returning task for execution and returns a
     * Future representing the pending results of the task. The
     * Future's {@code get} method will return the task's result upon
     * successful completion.
     *
     * <p>
     * If you would like to immediately block waiting
     * for a task, you can use constructions of the form
     * {@code result = exec.submit(aCallable).get();}
     *
     * <p>Note: The {@link Executors} class includes a set of methods
     * that can convert some other common closure-like objects,
     * for example, {@link java.security.PrivilegedAction} to
     * {@link Callable} form so they can be submitted.
     *
     * @param task the task to submit
     * @param <T> the type of the task's result
     * @return a Future representing pending completion of the task
     * @throws RejectedExecutionException if the task cannot be
     *         scheduled for execution
     * @throws NullPointerException if the task is null
     */
    <T> Future<T> submit(Callable<T> task);

    /**
     * Submits a Runnable task for execution and returns a Future
     * representing that task. The Future's {@code get} method will
     * return the given result upon successful completion.
     *
     * @param task the task to submit
     * @param result the result to return
     * @param <T> the type of the result
     * @return a Future representing pending completion of the task
     * @throws RejectedExecutionException if the task cannot be
     *         scheduled for execution
     * @throws NullPointerException if the task is null
     */
    <T> Future<T> submit(Runnable task, T result);

    /**
     * Submits a Runnable task for execution and returns a Future
     * representing that task. The Future's {@code get} method will
     * return {@code null} upon <em>successful</em> completion.
     *
     * @param task the task to submit
     * @return a Future representing pending completion of the task
     * @throws RejectedExecutionException if the task cannot be
     *         scheduled for execution
     * @throws NullPointerException if the task is null
     */
    Future<?> submit(Runnable task);

根据定义咱们就可以看出，sumbit是可以定义返回值的。

-看下Executor中的execute

/**
     * Executes the given command at some time in the future.  The command
     * may execute in a new thread, in a pooled thread, or in the calling
     * thread, at the discretion of the {@code Executor} implementation.
     *
     * @param command the runnable task
     * @throws RejectedExecutionException if this task cannot be
     * accepted for execution
     * @throws NullPointerException if command is null
     */
    void execute(Runnable command);

根据定义，execute是没有返回值的。

所以据上，可以得出submit和execute的区别，一个是可以有返回值，一个是没有返回值。

暂时更新到这....先上班写bug了