Java枚举继承
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Java enum inheritance
提问by Szymon Lipiński
Possible Duplicate:
add values to enum
可能的重复：
向枚举添加值
Why enums in Java cannot inherit from other enums? Why is this implemented this way?
为什么 Java 中的枚举不能从其他枚举继承？为什么以这种方式实现？
采纳答案by TofuBeer
Because adding elements to an enum would effectively create a super class, not a sub class.
Consider:
因为将元素添加到枚举将有效地创建一个超类，而不是一个子类。
考虑：
enum First {One, Two}
enum Second extends First {Three, Four}
First a = Second.Four; // clearly illegal
Second a = First.One; // should work
This is the reverse of the way it works with regular classes. I guess it could be implemented that way but it would be more complicated to implement than it would seems, and it would certainly confuse people.
这与常规类的工作方式相反。我想它可以通过这种方式实施，但实施起来会比看起来更复杂，而且肯定会让人们感到困惑。
