我可以在 Java 中设置枚举起始值吗? [英] Can I set enum start value in Java?

问题描述

我使用枚举来创建一些常量:

I use the enum to make a few constants:

enum ids {OPEN, CLOSE};

OPEN 值为零，但我想要它为 100.这可能吗?

the OPEN value is zero, but I want it as 100. Is it possible?

推荐答案

Java 枚举与 C 或 C++ 枚举不同，后者实际上只是整数的标签.

Java enums are not like C or C++ enums, which are really just labels for integers.

Java 枚举的实现更像是类 - 它们甚至可以有多个属性.

Java enums are implemented more like classes - and they can even have multiple attributes.

public enum Ids {
    OPEN(100), CLOSE(200);

    private final int id;
    Ids(int id) { this.id = id; }
    public int getValue() { return id; }
}

最大的区别在于它们类型安全，这意味着您不必担心将 COLOR 枚举分配给 SIZE 变量.

The big difference is that they are type-safe which means you don't have to worry about assigning a COLOR enum to a SIZE variable.

参见 http://docs.oracle.com/javase/tutorial/java/javaOO/enum.html 了解更多.

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