允许枚举在Java中使用setter吗？ [英] Are enums allowed to have setters in Java?

问题描述

我有一个枚举，它具有一个 String 的参数（字段）。
我可以在此字段中使用二传手吗？

I have an enum and it has a parameter (field) that is a String. Am I allowed to have a setter for this field?

public enum Blah {
    Monday("a"), Tuesday("b");
}

private final String letter;

Blah(String letter){
    this.letter = letter;
}

我可以做以下事情吗？

public String setLetter(String letter){
    this.letter = letter;
}

推荐答案

您需要删除 final 字段的修饰符，以便使其可设置：

You need to remove the final modifier of the field in order for it to be settable:

public enum Blah {
    Monday("a"), Tuesday("b");


    private String letter;

    private Blah(String letter){
        this.letter = letter;
    }

    public void setLetter(String letter){
        this.letter = letter;
    }
}

http://ideone.com/QAZHol

通常不建议在枚举中使用可变状态，但是

Having mutable state in an enum is generally not recommended, however.

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