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我正在为ThreadPoolExecutor设置而苦苦挣扎，不明白为什么创建的线程数没有达到定义maximumPoolSize并限制在corePoolSize.

以下是线程池设置：

public class Parallel {

    public static ThreadPoolExecutor EXECUTOR;

    static {
        ThreadPoolExecutor executorService = new ThreadPoolExecutor(5, Integer.MAX_VALUE, 1,
                TimeUnit.MINUTES, new LinkedBlockingQueue<>());
        executorService.allowsCoreThreadTimeOut();
        EXECUTOR = executorService;
    }

}

当我启动应用程序时，我注入了 7 个callable任务，并希望日志显示已创建 7 个线程。但是我可以观察到的是，当应该并行化所有提交的任务时，只创建了 5 个线程。

2021-10-03 15:41:34.034 INFO  [pool-1-thread-2] Task - Thread [ pool-1-thread-2 ] doing things inside Task's call() method
2021-10-03 15:41:34.034 INFO  [pool-1-thread-4] Report - Thread [ pool-1-thread-4 ] doing things inside Report's call() method
2021-10-03 15:41:34.034 INFO  [pool-1-thread-1] Monitor - Launching [ Task | Task(number=4) ] callable
2021-10-03 15:41:34.034 INFO  [pool-1-thread-5] Task - Thread [ pool-1-thread-5 ] doing things inside Task's call() method
2021-10-03 15:41:34.034 INFO  [pool-1-thread-3] Report - Thread [ pool-1-thread-3 ] doing things inside Report's call() method
2021-10-03 15:41:34.034 INFO  [pool-1-thread-1] SuperWrapper - All callables launched
2021-10-03 15:41:34.034 INFO  [pool-1-thread-1] Task - Thread [ pool-1-thread-1 ] doing things inside Task's call() method
2021-10-03 15:41:39.039 INFO  [main] LimitWorkaround - Computing callables...
2021-10-03 15:41:44.044 INFO  [main] LimitWorkaround - Computing callables...

如果我将corePoolSize5 更改为 10，maximumPoolSize最多 20（例如），日志将显示一些[pool-1-thread-10]但不会超过 10，即corePoolSize.

有什么理由吗？

提前谢谢。

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