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

公共枚举废话{A B C D}

我想找到一个字符串的枚举值，例如 "A" 就是 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.>

注意名称必须完全匹配，包括大小写:Blah.valueOf("a")和Blah.valueOf("A") 都抛出一个 IllegalArgumentException.

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

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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