聊一聊泛型的可空性（kotlin）

什么？泛型本身也可以是nullable？上来就抛这么个问题实在是不够友好~ 首先回顾，什么是泛型？Oracle Java Tutorials Introduced in J2SE 5.0, this long-awaited enhancement to the type system allows a type or method to operate on objects of various

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