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ThreadPoolExecutor thread pool

Thread creation and destruction consume a lot of resources, just like a company recruiting a group of employees at 9 a.m. and firing a group of employees at 6 p.m., which destroys a lot of resources. Therefore, it is necessary to make rational use of the fixed and stable threads in the "pool".

Extended relationship

ThreadPoolExecutor construction method

There are four construction methods for ThreadPoolExecutor:

ThreadPoolExecutor (int, int, long, TimeUnit, BlockingQueue) ThreadPoolExecutor (int, int, long, TimeUnit, BlockingQueue, ThreadFactory) ThreadPoolExecutor (int, int, long, TimeUnit, BlockingQueue, RejectedExecutionHandler) ThreadPoolExecutor (int, int, long, TimeUnit, BlockingQueue, ThreadFactory, RejectedExecutionHandler)

Take the construction method of the most parameters as an example to analyze:

Public ThreadPoolExecutor (int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue workQueue, ThreadFactory threadFactory RejectedExecutionHandler handler) {/ / Core thread pool cannot be less than 0 if (corePoolSize < 0 | | / / the maximum pool size cannot be less than or equal to 0 maximumPoolSize

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