Type polymorphism and polymorphism in object-oriented programming: Read Wikipedia's articles about polymorphism, including subtype polymorphism.

类型多态性和面向对象编程的多态性：阅读有关多态性的Wikipedia文章，包括子类型多态性。

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But then, the same limitation is true of polymorphism — it is only helpful when you cannot constrain an object to a single type for every execution path.

但是，多态性也具有同样的限制-它只在您不能对于每个执行路径将对象约束为单个类型时才有所帮助。

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Type parameters (polymorphism).

类型参数(多态性)。

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