To add new methods to a particular class of type t, it only needs to define static methods that accept type t as the first parameter.

要向类型为t的特定类添加新方法，只需定义一个静态方法，它接受类型T作为第一个参数。

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The method that does not take the extra parameter creates a new instance of the appropriate type and then calls the method that does take the extra parameter.

没有采用附加参数的方法创建一个新的适当类型的实例，然后调用采用附加参数的方法。

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First off, in order to form a legal new expression on a type parameter, such as new T(), it's necessary to make sure that we're calling a constructor that is valid for every instantiation of T.

首先， 为了对类型参数构造合法的 new 表达式（如 new T() ）， 必须确保我们调用的构造函数对于 T 的每个实例化都有效。

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