检查类是否为 java.lang.Enum
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Checking if a class is java.lang.Enum
提问by Jose L Martinez-Avial
I'm trying to know if a class is an Enum, but I think I'm missing something:
我想知道一个类是否是一个枚举,但我想我错过了一些东西:
if (test.MyEnum.class instanceof Enum<?>.class)
obj = resultWrapper.getEnum(i, test.MyEnum.class);
else
obj = resultWrapper.getObject(i);
It gives me an error saying that Enum.class is not valid. So how I can check if a class is a Enum? I'm pretty sure it is possible to determine that, I'm just unable to get it.
它给了我一个错误,说 Enum.class 无效。那么我如何检查一个类是否是一个 Enum 呢?我很确定可以确定,我只是无法得到它。
Thanks
谢谢
采纳答案by Sean Patrick Floyd
The correct syntax would be:
正确的语法是:
Enum.class.isAssignableFrom(test.MyEnum.class)
but for enums, here is a more convenient method:
但是对于枚举,这里有一个更方便的方法:
if (someObject.getClass().isEnum()))
Update: for enum items with a body (e. g. that override methods), this won't actually work. In that case, use
更新:对于具有主体的枚举项(例如覆盖方法),这实际上不起作用。在这种情况下,请使用
if (someObject instanceof Enum<?>)
Reference:
参考:
回答by Roman
If you're talking about Java 5 new feature - enum
(it's not very new actually), then this is the way to go:
如果您在谈论 Java 5 新功能 - enum
(实际上并不是很新),那么这就是要走的路:
if (obj.getClass().isEnum()) {
...
}
If Enum
is your custom class, then just check that obj instanceof Enum
.
如果Enum
是您的自定义类,那么只需检查obj instanceof Enum
.