反思：建立消费者<a> when A could dynamically be any class?

Question

I know to create an object dynamically of any class, I can do

Class<?> c = Class.forName("fully equalified name");
Object o = c.getDeclaredConstructor(TypeParams).newInstance();

But say now I need to create a Consumer and pass it to a method. It is not enough to just pass in the raw type Consumer because that method (given to me) internally needs to figure out A using reflection.

Is there a way to do so in Java?

Answer 1

erased nature of generics使您想做的事情变得不可能。

Answer 2

没有办法找出A＆＃34;来自SELECT * FROM aset WHERE ttime >= (SELECT MAX (ttime) FROM aset) - INTERVAL '5' MINUTE; 一般。此外，您不能做任何不同于创建原始消费者的事情。

您几乎肯定需要明确传递 with bset AS (SELECT ttime, cnt, MAX (ttime) OVER () - ttime AS delta FROM aset) SELECT * FROM bset WHERE delta <= INTERVAL '5' MINUTE 个对象。