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From: =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne@vajhoej.dk>
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Subject: Re: Overloading methods question
Date: Sat, 27 Oct 2018 19:38:56 -0400
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On 10/27/2018 6:36 PM, Martin Gregorie wrote:
> On Fri, 26 Oct 2018 20:58:44 -0400, Arne Vajhøj wrote:
>> On 10/26/2018 3:33 PM, Martin Gregorie wrote:
>>>                                         which is why I thought it
>>> could not be declared inside a class definition.
>>
>> You can put a class declaration inside a class.
>
> Yes indeed, but as I found out it seems not so simple to access it from
> outside. The following shows how I wanted to declare and use a enum, i.e.
> as a direct a replacement for the set of public static final ints).
> Here's an SSCCE that shows the problem.
> 
> public class EnumWrapper
> {
>     public enum MyEnum { ONE, TOO, TREE };

>     public static void printVal(MyEnum v)
>     {
>        System.out.println("printval(" + v + ")");
>     }
> }
> 
> This works as expected with the enum used inside its declaring class:

> BUT, I also want to use it as a parameter when calling a methods in the
> class where the enum is declared, IOW exactly how I'd use a public static
> final int declared in the class:
> 
> public class TestRun
> {
>     public static void main(String args[])
>     {
>        EnumWrapper ew = new EnumWrapper();
> 
>        ew.printval(MyEnum.ONE);
>     }
> }
> 
> ... and this won't compile:

 > and, if I replace 'MyEnum' with "EnumWrapper", the name of the class,
 > it still fails to compile:

Normal name rules aka same as for nested classes.

public class TestRun
{
    public static void main(String args[])
    {
       EnumWrapper ew = new EnumWrapper();
       ew.printVal(EnumWrapper.MyEnum.ONE);
    }
}

should work.

import EnumWrapper.MyEnum;

public class TestRun2
{
    public static void main(String args[])
    {
       EnumWrapper ew = new EnumWrapper();
       ew.printVal(MyEnum.ONE);
    }
}

should also work.

The enums full name is EnumWrapper.MyEnum so either
full name or an import to use short name.

(in real life there would also be a package, but ...)

Arne