问题描述
我想有一个 ScheduledThreadPoolExecutor ，它还会停止最后一个线程，如果没有工作要做，并创建（并保持线程活着一段时间）if有新的任务。
I'd like to have a ScheduledThreadPoolExecutor which also stops the last thread if there is no work to do, and creates (and keeps threads alive for some time) if there are new tasks. But once there is no more work to do, it should again discard all threads.
我天真地创建为新的ScheduledThreadPoolExecutor（0），因此，不会创建任何线程，也不会执行任何计划的任务。
I naivly created it as new ScheduledThreadPoolExecutor(0) but as a consequence, no thread is ever created, nor any scheduled task is ever executed.
任何人都可以告诉我，如果我能实现我的目标，在 ScheduledThreadpoolExecutor ？
Can anybody tell me if I can achieve my goal without writing my own wrapper around the ScheduledThreadpoolExecutor?
提前感谢！
推荐答案
实际上你可以这样做，但它的非显而易见的：
Actually you can do it, but its non-obvious:
- 在构造函数中将核心线程设置为所需的最大线程数
- 设置执行器的keepAliveTime
-
并且最后允许核心线程超时
- Create a new ScheduledThreadPoolExecutor
- In the constructor set the core threads to the maximum number of threads you want
- set the keepAliveTime of the executor
and at last, allow the core threads to timeout
m_Executor = new ScheduledThreadPoolExecutor ( 16,null );
m_Executor.setKeepAliveTime ( 5, TimeUnit.SECONDS );
m_Executor.allowCoreThreadTimeOut ( true );
这仅适用于Java 6，但
This works only with Java 6 though
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