public ThreadPoolExecutor(int corePoolSize,
int maximumPoolSize,
long keepAliveTime,
TimeUnit unit,
BlockingQueue workQueue)
corepoolsize核心线程数 maximumpoolsize最大线程数 keepaliveTime 存活时间 unit 时间单位 workqueue等待队列
拒绝策略4种
abortPOLICY callerrunspolicy discardpolicy diascardoldestpolicy


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