Java枚举继承 [英] Java enum inheritance

问题描述

可能重复：

为枚举添加值

为什么Java中的枚举不能从其他枚举继承？为什么这样实现？

Why enums in Java cannot inherit from other enums? Why is this implemented this way?

推荐答案

从这里窃取的示例

因为向枚举添加元素
会有效地创建一个超
类，而不是子类。

Because adding elements to an enum would effectively create a super class, not a sub class.

考虑：

 enum First {One, Two}   
 enum Second extends First {Three, Four}   

 First a = Second.Four;   // clearly illegal 
 Second a = First.One;  // should work

这与$ b的方式相反$ b适用于常规课程。我猜这个
可以用那种方式实现，但实现
比实际看起来更复杂，而b $ b肯定会让人感到困惑。

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.

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