聊一聊泛型的可空性（kotlin）

什麼？泛型本身也可以是nullable？上來就拋這麼個問題實在是不夠友好~ 首先回顧，什麼是泛型？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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