Java thread pool how to use the ThreadPoolExecutor class

This article will explain in detail how to use the java thread pool ThreadPoolExecutor class. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

In the Alibaba java Development Manual, it is pointed out that thread resources must be provided through the thread pool, and the creation of threads shown in the application is not allowed, so on the one hand, the creation of threads is more standardized, and the number of threads can be reasonably controlled; on the other hand, thread details management is handed over to thread pool processing, which optimizes the cost of resources. However, thread pools are not allowed to be created by Executors, but by ThreadPoolExecutor. On the one hand, although the Executor framework in jdk provides methods to create thread pools, such as newFixedThreadPool (), newSingleThreadExecutor (), newCachedThreadPool (), etc., they all have their limitations and are not flexible enough. In addition, because the previous methods are also implemented internally through ThreadPoolExecutor, using ThreadPoolExecutor can help you clarify the running rules of thread pools, create thread pools that meet the needs of your business scenarios, and avoid the risk of resource exhaustion.

Let's give a detailed overview of how to use ThreadPoolExecutor.

First, take a look at the constructor of ThreadPoolExecutor.

Public ThreadPoolExecutor (int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue workQueue, ThreadFactory threadFactory, RejectedExecutionHandler handler) {if (corePoolSize < 0 | maximumPoolSize