Java线程池ThreadFactory

package com.wkcto.threadpool;

import java.util.Random;
import java.util.concurrent.*;

/**
 * 自定义线程工厂
 */
public class Test04 {
    public static void main(String[] args) throws InterruptedException {
        //定义任务
        Runnable r = new Runnable() {
            @Override
            public void run() {
                int num = new Random().nextInt(10);
                System.out.println(Thread.currentThread().getId() + "--" + System.currentTimeMillis() + "开始睡眠:" + num + "秒");
                try {
                    TimeUnit.SECONDS.sleep(num);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };
        //创建线程池, 使用自定义线程工厂, 采用默认的拒绝策略是抛出异常
        ExecutorService executorService = new ThreadPoolExecutor(5, 5, 0, TimeUnit.SECONDS, new SynchronousQueue<>(), new ThreadFactory() {
            @Override
            public Thread newThread(Runnable r) {
                //根据参数r接收的任务,创建一个线程
                Thread t = new Thread( r );
                t.setDaemon(true);  //设置为守护线程, 当主线程运行结束,线程池中的线程会自动退出
                System.out.println("创建了线程: " + t);
                return t ;
            }
        });

        //提交5个任务, 当给当前线程池提交的任务超过5个时,线程池默认抛出异常
        for (int i = 0; i < 5; i++) {
            executorService.submit(r);
        }

        //主线程睡眠
        Thread.sleep(10000);
        //主线程睡眠超时, 主线程结束, 线程池中的线程会自动退出
    }
}