Shulou(Shulou.com)05/31 Report--

Today, the editor will share with you the relevant knowledge points of Java generics covariant, inverter, extends and super selection methods, detailed content, clear logic, I believe that most people still know too much about this knowledge, so share this article for your reference, I hope you can get something after reading this article, let's take a look at it.

To understand covariance and inversion, we must first introduce:

According to the Liskov substitution principle, if C is a subclass of P, then P can replace C, that is, P p = new C ()

C inherits from P and is recorded as C < P

What is the same?

If F is constant, when C.

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