Represents type declarations: class types, interface types, array types, value types, enumeration types, type parameters, generic type definitions, and open or closed constructed generic types.

• 表示类型声明:类类型、接口类型、数组类型、值类型、枚举类型、类型参数、泛型类型定义,以及开放或封闭构造的泛型类型。