如何从Java中的字符串值中获取枚举值 [英] How to get an enum value from a string value in Java

问题描述

假设我有一个枚举，它只是

公共枚举 Blah {A B C D}

我想找到一个字符串的枚举值，例如 A"，它是 Blah.A.怎么可能做到这一点?

是 Enum.valueOf() 我需要的方法?如果是这样，我将如何使用它?

解决方案

是的，Blah.valueOf("A") 会给你Blah.A.p>

请注意，名称必须是精确匹配，包括大小写:Blah.valueOf("a") 和 Blah.valueOf("A") 都抛出 IllegalArgumentException.

静态方法 valueOf() 和 values() 是在编译时创建的，不会出现在源代码中.不过，它们确实出现在 Javadoc 中；例如，Dialog.ModalityType 显示这两种方法.

Say I have an enum which is just

public enum Blah {
    A, B, C, D
}

and I would like to find the enum value of a string, for example "A" which would be Blah.A. How would it be possible to do this?

Is the Enum.valueOf() the method I need? If so, how would I use this?

解决方案

Yes, Blah.valueOf("A") will give you Blah.A.

Note that the name must be an exact match, including case: Blah.valueOf("a") and Blah.valueOf("A ") both throw an IllegalArgumentException.

The static methods valueOf() and values() are created at compile time and do not appear in source code. They do appear in Javadoc, though; for example, Dialog.ModalityType shows both methods.

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