java - 为枚举字符串值定义常量 "Value"

Question

对于如下定义的枚举

public enum Cars {

    SWIFT("Maruti"),
    DZIRE("Maruti"), 
    CIAZ("Maruti"), 
    I10("Hyundai"), 
    CRETA("Hyundai");

    String company;
    Cars(String company){
        this.company = company;
    }   
}

有 Sonar 错误

定义一个常量，而不是将这个文字“Maruti”复制 3 次。

如果我们定义静态字符串，编译失败

无法在定义前引用字段

解决方案一:

public enum Cars {

    SWIFT(CarsString.MARUTI.companyName),DZIRE("Maruti"), I10("Hyundai"), CRETA("Hyundai");

    static String MARUTI = "Maruti";
    String company;
    Cars(String company){
        this.company = company;
    }

    enum CarsString {
        MARUTI("maruti"),
        HYUNDAI("Hyundai");
        String companyName;
        CarsString(String companyName){
            this.companyName = companyName;
        }
    }
}

解决方案 2:

不确定这是否是我们的做法。当它未被 Cars.MARUTI 引用时，它会出错 Cannot reference a field before it is defined。

public enum Cars {

    SWIFT(Cars.MARUTI),DZIRE(Cars.MARUTI), I10("Hyundai"), CRETA("Hyundai");

    public static final String MARUTI = "Maruti";
    String company;
    Cars(String company){
        this.company = company;
    }
 }

我有 10 个处于相似状态的枚举，上面的解决方案 1 并没有给我太大的鼓励。方案二解决目的，

but why should we refer by Cars.MARUTI and not MARUTI directly? is that a limitation ?

我们如何在枚举中引用常量值？

Answer 1

如何在自己的 Enum 中定义公司？例如:

public enum Car {
    SWIFT(Company.MARUTI),
    DZIRE(Company.MARUTI),
    CIAZ(Company.MARUTI),
    I10(Company.HYUNDAI),
    CRETA(Company.HYUNDAI);

    Company company;

    Cars(Company company) {
        this.company = company;
    }
}

public enum Company {
    HYUNDAI("Hyundai"),
    MARUTI("Maruti");

    String name;

    Company(String name) {
        this.name = name;
    }
}

更新:根据@Basil Bourque 的评论改进了命名约定，谢谢!