Re: Use an enumeration and an annotation

From:
"cirudinezidane@gmail.com" <cirudinezidane@gmail.com>
Newsgroups:
comp.lang.java.help
Date:
Mon, 14 Jun 2010 04:17:56 -0700 (PDT)
Message-ID:
<1f9c1438-b284-4f75-80a0-ba6c35ce26d6@i31g2000yqm.googlegroups.com>
Thanks,it's OK!

On 13 jun, 05:01, "John B. Matthews" <nos...@nospam.invalid> wrote:

In article
<7e5c63e4-be72-4046-a59f-0559e8c7c...@i31g2000yqm.googlegroups.com>,

 "cirudinezid...@gmail.com" <cirudinezid...@gmail.com> wrote:

I have a problem because i want to use an enumeration and get its
constant to create an array of ints,

I have the next code:

public enum ABC {A, B, C};

@Order(values={ABC.A.ordinal(),ABC.C.ordinal(),ABC.B.ordinal()})
public void getProperty(){}

values is declared as an annotation like the follow code:

public @interface Order {
public int[] values();
}

I have an error that says: "The value for annotation attribute
Order.values must be a constant expression"

How can I solve this problem?


I don't see how this can work. As discussed in annotations [1], the
values must be constant expressions [2]. Alternatively, annotations
may be used on enum constants:

    public enum ABC { A, B, C };

    public @interface Order {
        ABC[] value();
    }

    @Order(value = { ABC.A, ABC.C, ABC.B })

[1]<http://java.sun.com/docs/books/jls/third_edition/html/interfaces.html=

....>

[2]<http://java.sun.com/docs/books/jls/third_edition/html/expressions.htm=

....>

--
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>

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