executor.execute注释

`Executor.execute()`是Java并发编程中ExecutorService接口的一个常用方法，它用于异步执行提交的任务。这个方法的作用是在给定的线程池中执行Runnable或Callable任务。以下是方法的主要注释：

/**
 * Executes the given command at some time in the future and returns
 * immediately. If a parallel execution was possible, some of the commands may have
 * been executed concurrently.
 *
 * <p>This method does not guarantee any particular order of execution.
 *
 * @param command the task to execute
 * @throws RejectedExecutionException if this {@code Executor} has been shut down,
 *         or some other cause prevents the command from being accepted for
 *         execution.
 */
public void execute(Runnable command) throws RejectedExecutionException;

- `command`: 需要执行的任务，可以是一个实现了Runnable接口的对象，也可以是实现了Callable接口的对象，返回值会被Future获取。
- 返回值：`void`，表示方法立即返回，并不阻塞。
- 异常处理：如果Executor已关闭，或者由于其他原因无法接受任务，可能会抛出RejectedExecutionException异常。