java - 如何从Java中的字符串值获取枚举值？(How to get an enum value from a string value in Java?)

Question

Say I have an enum which is just

(说我有一个枚举)

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 .

(我想找到一个字符串的枚举值，例如"A"就是Blah.A)

How would it be possible to do this?

(怎么可能做到这一点？)

Is the Enum.valueOf() the method I need?

(Enum.valueOf()是我需要的方法吗？)

If so, how would I use this?

(如果是这样，我将如何使用它？)

  ask by Malachi translate from so

Answer 1

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

(是的， Blah.valueOf("A")将给您Blah.A)

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

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

The static methods valueOf() and values() are created at compile time and do not appear in source code.

(静态方法valueOf()和values()在编译时创建，并且不会出现在源代码中。)

They do appear in Javadoc, though;

(但是，它们确实出现在Javadoc中。)

for example, Dialog.ModalityType shows both methods.

(例如， Dialog.ModalityType显示两个方法。)