Can enums be subclassed to add new elements?

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No, you can’t do this in Java. Aside from anything else, d would then presumably be an instance of A (given the normal idea of “extends”), but users who only knew about A wouldn’t know about it – which defeats the point of an enum being a well-known set of values.

If you could tell us more about how you want to use this, we could potentially suggest alternative solutions.

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