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並前往https://medium.com/huawei-developers/flutter-enhanced-enums-the-powerful-feature-of-dart-2-17-new-feature-of-flutter-3-0-8177a926e487

‍ Flutter| Enhanced Enums: The Powerful Feature of Dart 2.17 ...

Factory constructors can only return one of the fixed, known enum instances. No other class can be extended as Enum is automatically extended.

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