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.
因为我们希望List成为其所包含的元素类型的泛型，所以希望静态factory方法带有类型变量t这一参数并返回List的实例。
A static factory method on a generic or a non-generic class?
一个静态的泛型和非泛型类工厂方法？
A static factory method on a generic or a non-generic class?
一个静态的泛型和非泛型类工厂方法？
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