不推荐Executors创建线程池

线程池不允许使用Executors去创建，而是通过ThreadPoolExecutor的方式，这样的处理方式让写的同学更加明确线程池的运行规则，规避资源耗尽的风险。 说明：Executors返回的线程池对象的弊端如下：
1）FixedThreadPool和SingleThreadPool:
  允许的请求队列长度为Integer.MAX_VALUE，可能会堆积大量的请求，从而导致OOM。
2）CachedThreadPool:
  允许的创建线程数量为Integer.MAX_VALUE，可能会创建大量的线程，从而导致OOM。

这是阿里巴巴开发手册规范

推荐方式 

Positive example 1：
    //org.apache.commons.lang3.concurrent.BasicThreadFactory
    ScheduledExecutorService executorService = new ScheduledThreadPoolExecutor(1,
        new BasicThreadFactory.Builder().namingPattern("example-schedule-pool-%d").daemon(true).build());
       
        
            
Positive example 2：
    ThreadFactory namedThreadFactory = new ThreadFactoryBuilder()
        .setNameFormat("demo-pool-%d").build();

    //Common Thread Pool
    ExecutorService pool = new ThreadPoolExecutor(5, 200,
        0L, TimeUnit.MILLISECONDS,
        new LinkedBlockingQueue(1024), namedThreadFactory, new ThreadPoolExecutor.AbortPolicy());

    pool.execute(()-> System.out.println(Thread.currentThread().getName()));
    pool.shutdown();//gracefully shutdown
       
        
            
Positive example 3：
    
        
        
        

    
        
            
        
    
    //in code