ThreadPoolExecutor添加线程不执行，为什么

Question

import com.google.common.util.concurrent.ThreadFactoryBuilder;

import java.util.concurrent.*;

public class MyBlockingQueue implements Runnable {

BlockingQueue<String> queue;

private int index;

public MyBlockingQueue(BlockingQueue<String> queue, int index) {
    this.queue = queue;
    this.index = index;
}

@Override
public void run() {
    try {
        queue.put(String.valueOf(this.index));
        System.out.println("{" + this.index + "} in queue!");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static void main(String args[]) {
    BlockingQueue<String> queue = new LinkedBlockingQueue<String>(3);

    ThreadFactory factory = new ThreadFactoryBuilder().setNameFormat("aaa-%s").build();
    ExecutorService pool = new ThreadPoolExecutor(5, 200, 0L, TimeUnit.MILLISECONDS,
            new LinkedBlockingQueue<>(1024), factory, new ThreadPoolExecutor.AbortPolicy());

    for (int i = 0; i < 10; i++) {
        pool.submit(new MyBlockingQueue(queue, i));
    }

  //为什么这里的线程不执行呢？
    pool.submit(() -> {
        try {
            while (true) {
                System.out.println("=======" + queue.size());
                if (queue.isEmpty()) {
                    break;
                }
                String str = queue.take();
                System.out.println(str + " has take!");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    });

    pool.shutdown();
}

}

Answer 1

首先想说一下，其中的问题，阻塞队列和工厂模式OK，
在创建线程池的时候并不建议使用ExecutorService 中的构造函数，而是使用Executors里面提供的四种静态方法，很多的参数配置已经写好。

其次，给线程池submit的应该是线程，而不是阻塞队列，你那里submit的是阻塞队列噢，循环体里面你可以写一个自己的类
比如（class MyThread extends Thread）,再写一个print，sleep一下，就可以看到线程池的执行啦。

https://blog.csdn.net/whandwho/article/details/82931798 这个博客下方第八点