Explain Java thread pool in detail

    The thread pool in Java is the most used concurrent framework, and almost all programs that need to execute tasks asynchronously or concurrently can use the thread pool. In the development process, the rational use of thread pools can bring three benefits.

    First: reduce resource consumption. Reduce the cost of thread creation and destruction by reusing already created threads.

    Second: improve the response speed. When a task arrives, the task can be executed immediately without waiting for the thread to be created.

    Third: improve the manageability of threads. Threads are scarce resources. If they are created without restrictions, they will not only consume system resources, but also reduce the stability of the system. Using thread pools can be used for unified allocation, tuning, and monitoring.

1. Thread pool implementation principle