code: public static ThreadFactory newNamedThreadFactory(String prefix, ThreadGroup threadGroup, boolean isDeamon) {
  		return new NamedThreadFactory(prefix, threadGroup, isDeamon);
  	}
docs: 创建线程工厂
  
  @param prefix 线程名前缀
  @param threadGroup 线程组，可以为null
  @param isDeamon 是否守护线程
  @since 4.0.0