TopicKind 枚举类定义了主题的种类 这些种类用于标识主题的性质或用途
Returns a representation of an immutable list of all enum entries, in the order they're declared.
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
Returns an array containing the constants of this enum type, in the order they're declared.