The generic type argument declares the type of result this CriteriaQuery will return upon execution.
泛型参数声明CriteriaQuery在执行时返回的结果的类型。
The angle brackets assign a specific type (that is, the parameterized type) to the generic type represented by the "T" argument types.
尖括号为由 “T”参数类型表示的泛型指定具体类型。
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。
Unfortunately, you can't invoke a generic constructor with a wildcard type argument, even though you know such a constructor exists. However, you can do this.
不幸的是，您不能用通配符类型的参数调用泛型构造函数，即使知道存在这样的构造函数也不行。
When a constraint is applied to a generic type parameter, an implicit identity or reference conversion must exist from the concrete argument to the type of the constraint.
在将某一约束应用于泛型类型参数时，必须存在从具体参数到该约束类型的隐式标识或引用转换。
When a constraint is applied to a generic type parameter, an implicit identity or reference conversion must exist from the concrete argument to the type of the constraint.
在将某一约束应用于泛型类型参数时，必须存在从具体参数到该约束类型的隐式标识或引用转换。
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