Re: Static import

From:
Patricia Shanahan <pats@acm.org>
Newsgroups:
comp.lang.java.programmer
Date:
Fri, 26 Jun 2009 07:31:42 -0700
Message-ID:
<op6dnTFX9b9KRtnXnZ2dnUVZ_rqdnZ2d@earthlink.com>
Karsten Wutzke wrote:

On 26 Jun., 16:06, Patricia Shanahan <p...@acm.org> wrote:

Karsten Wutzke wrote:

Hello,
I just compiled a class with a *static* import
import static org.domain.action.*;
but I don't get what this means. I had expected an error.
So, why does this compile? This would mean package-level constants... -

?

I tried this in Eclipse: import static java.util.*;

and got a reasonable error message "Only a type can be imported,
java.util resolves to a package". What compiler are you using?

Patricia


Don't know really. I'll have to check. I'm using the all-new Eclipse
3.5 inbuilt compiler.

I just realized the imports you tried don't compile for me either. I
seem to have tried something special:

The preamble for my class is

--

package com.kawoolutions.commons.action;

import java.util.*;

import static com.kawoolutions.commons.action.*; //same package as
above, no error
//import static com.kawoolutions.commons.action.CommonActions.*;
//import static com.kawoolutions.commons.action.CommonPrefixes.*;
//import static com.kawoolutions.commons.action.CommonSuffixes.*;

public class
IWantToUseConstantsFromClassesWithinThisPackageWithoutQualifying
{

...

}

--

So the special situation here seems to be that I was trying to do such
a static import from the same package to avoid the multiple imports
just for the specific classes. I was just trying it to save a few
lines to be honest. But why does this work? This should probably be an
error nonetheless, right?


I get the same effect - error if I import static * a different package,
none if I import static * the package containing the importing module. I
suspect that the compiler is noticing that wildcard importing one's own
package does nothing before it notices that is should be an error
because of the "static".

Patricia

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