编译器错误“找不到符号-类ENUM_NAME" [英] Compiler error "cannot find symbol - class ENUM_NAME"

问题描述

我已经定义了一个枚举.当我尝试写:

I have defined an enum. When I try to write:

private ENUM_NAME variableName;

作为类的实例变量，编译器告诉我:

as the instance variable of a class, the compiler tells me:

cannot find symbol - class ENUM_NAME

这阻止了我继续前进.

如果使用的话，我正在使用BlueJ IDE.所有文件都包含在一个程序包中，并且位于我的计算机上的同一文件夹中.我从另一个类(工作类的测试驱动程序)内部的枚举开始，然后在工作类中遇到了所述错误.然后，我尝试使枚举成为其自己的类，但出现了同样的错误.

I am using the BlueJ IDE, if that matters. All files are contained within one package, and are in the same folder on my computer. I began with the enum inside of another class (a test driver for my working class), and I got the stated error in my working class. Then I tried making the enum its very own class, and I got the same error.

测试驱动程序类:

public class BicycleMainClass
{
    enum BICYCLE_TYPE_ENUM {STANDARD, RACER, MOUNTAIN, BMX};
    //main method below
}

工作"类:

public class BicycleClass
{
    private BICYCLE_TYPE_ENUM bicycleType;
    //this line gives me the error "cannot find symbol - class BICYCLE_TYPE_ENUM"
}

我希望它可以编译而不会出错，因为枚举是有效的变量类型.我不明白什么?

I would expect it to compile without error, because enums are a valid variable type. What am I not understanding?

推荐答案

问题是您已将枚举类型声明为

The problem is that you have declared your enum type as a nested type of BicycleMainClass, so you need to include the outer type when referring to it:

class BicycleClass
{
    private BicycleMainClass.BICYCLE_TYPE_ENUM bicycleType;
}

另一种解决方案是简单地将您的枚举类型声明为顶级类型:

Another solution is simply to declare your enum type as a top-level type:

public enum BICYCLE_TYPE_ENUM {
    STANDARD, RACER, MOUNTAIN, BMX;
}

然后您可以直接参考它:

Then you can refer to it directly:

private BICYCLE_TYPE_ENUM bicycleType;

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