What is inheritance of classes in Java thread pool?

1. Description

The core implementation class of the thread pool in Java is ThreadPoolExecutor

Executor: only provides an interface for executing tasks, and users do not need to pay attention to how to create threads. How to make a thread, just provide a Runnable object.

ExecutorService: On the basis of task execution, interfaces such as task submission and thread pool life cycle management are added.

AbstractExecutorService: The process of abstract series execution tasks, ensuring that the implementation of the lower layer only needs to focus on the method of executing tasks.

ThreadPoolexecutor: On the one hand, it maintains its own life cycle, and on the other hand, it manages courses and tasks. The two are well combined to implement parallel tasks.

2. Example

// ctl：高三位表示线程池运行状态，低29位表示线程池线程运行数量
// 一个变量存储两个值的好处是不必费心思（比如加锁）去维护两个状态的一致性
private final AtomicInteger ctl = new AtomicInteger(ctlOf(RUNNING, 0));
 
// 获取线程池当前的运行状态（～：按位取反，即0变成1，1变成0。）
private static int runStateOf(int c)     { return c & ~CAPACITY; }
// 获取线程池当前运行的线程数量
private static int workerCountOf(int c)  { return c & CAPACITY; }
// 通过线程池状态和运行的线程数量获取ctl
private static int ctlOf(int rs, int wc) { return rs | wc; }

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