本文深入探讨了Java中Executor、ExecutorService、ScheduledExecutorService、ThreadFactory和Callable类的工厂方法，提供了创建和配置不同类型的线程池（如ThreadPoolExecutor、ScheduledThreadPool、singleThreadPool、cachedThreadPool和fixedThreadPool）的实用技巧，以及如何通过线程工厂和Callable来管理线程状态和任务执行。文章详细解释了每种线程池的特点及其适用场景。
提供了工厂方法：
Factory and utility methods for Executor, ExecutorService, ScheduledExecutorService, ThreadFactory, and Callable classes defined in this package. This class supports the following kinds of methods:
- Methods that create and return an
ExecutorServiceset up with commonly useful configuration settings. - Methods that create and return a
ScheduledExecutorServiceset up with commonly useful configuration settings. - Methods that create and return a "wrapped" ExecutorService, that disables reconfiguration by making implementation-specific methods inaccessible.
- Methods that create and return a
ThreadFactorythat sets newly created threads to a known state. - Methods that create and return a
Callableout of other closure-like forms, so they can be used in execution methods requiringCallable。
1、ExecutorService (为ThreadPoolExecutor设置了一些通用的参数来生成一些线程池，使用的BlockingQueue都是inbound的queue)
1、ScheduledThreadPool
2、singledThreadPool（线程的顺序执行，使用该线程池，可以保证线程的顺序性，不会竞争资源）
3、cachedThreadPool(默认是线程处于idle 6s就自动回收，适合大量而且小的异步任务)
4、FixedThreadPool
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