java - 在方法中初始化枚举类型时遇到问题

Question

我在初始化一周中的几天的基本枚举时遇到问题。这是我的代码:

public class Ch3_12 
{   
    public static void main(String[] args) 
    {
        public enum Day {MON, TUE, WED, THU, FRI, SAT, SUN}

    }
}

Answer 1

阅读编译器给您的错误消息:

public static void main(String[] args)
{
    public enum Day {MON, TUE, WED, THU, FRI, SAT, SUN}
    ^^^^^^ Modifier "public" not allowed here
}

...所以你删除修饰符:

public static void main(String[] args)
{
    enum Day {MON, TUE, WED, THU, FRI, SAT, SUN}
    ^^^^^^^^ enum must not be local
}

...因此您将其移出方法范围:

enum Day {MON, TUE, WED, THU, FRI, SAT, SUN}

public static void main(String[] args)
{
    // no more compiler errors...
}