generic type variable

基本解釋

So far, when dealing with collections, you've seen for/in used with a generic variable type, like Object.
迄今為止，在處理集合的時候，您已經(jīng)看到 for/in 使用通用的變量類型，例如 Object。
As you can see the type of the class variables is generic, but you can improve the generator to understand if a variable should contain a number or a function.
如你所見，類的成員變量的類型是通用類型，但是你可以改進(jìn)產(chǎn)生器，使之知道一個變量應(yīng)該包含一個數(shù)字或一個函數(shù)。
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Because we'd like our Lists to be generic in the type of element they contain, we'd like our static factory method to take an argument of type variable T and return an instance of List.
因?yàn)槲覀兿Ｍ?List 成為其所包含的元素類型的泛型，所以希望靜態(tài) factory 方法帶有類型變量 T 這一參數(shù)并返回 List 的實(shí)例。