Question

How could: Base class has import statement like: import DerivedClass

Asked by: http29

Hi

I have a base class in package hub, let me say hub.BasedClass

I have derived class in default package which is DerivedClass.

DerivedClass extends hub.BasedClass in package hub. Is it possible that there is statement in BasedClass: import DerivedClass.

Just like:

package hub;
import DerivedClass;
abstract public class BasedClass {
.......
}


import hub.BasedClass;
public class DerivedClass extends BasedClass {
......
}

Thanks.

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Asked On
2004-07-13 at 14:09:41ID21057587
Topic

Java Programming Language

Participating Experts
4
Points
75
Comments
11

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Answers

 

by: CEHJPosted on 2004-07-13 at 14:12:33ID: 11543400

>>import DerivedClass;

shouldn't be there. The directory structure should reflect the package structure and the classes should be in the right places

 

by: objectsPosted on 2004-07-13 at 15:54:58ID: 11544259

> import DerivedClass;

You used to be able to do that.

You now need to include DerivedClass in a package.

 

by: Yo-NuTZPosted on 2004-07-14 at 00:18:26ID: 11546423

What do you need it for? The imports are not necessary, if they are in the same package they see each other, for example, the derived class cand acces the base class by super.some. Please explain for what purpuse you need this and i can explain how to do it!

 

by: objectsPosted on 2004-07-14 at 01:08:08ID: 11546605

> The imports are not necessary, if they are in the same package

they aren't in the same package.
One of the reasons why I suggested moving DerivedClass into a package, and yes if it is moved into the hub package then no import is necessary.

 

by: fredwangusPosted on 2004-07-14 at 02:56:57ID: 11547094

If i am not wrong, BasedClass is the parent of DerivedClass, DerivedClass should be able to see BasedClass, thus import hub.BasedClass; is necessary.

While BasedClass needs not to see DerivedClass and import DerivedClass; should not be there.

 

by: http29Posted on 2004-07-14 at 05:32:34ID: 11548229

Hi Guys:

There is nothing wrong that I put 'import hub.BaseClass' in DerivedClass. The weired thing is that before we have DerivedClass, we should already have BaseClass since DerivedClass extends BaseClass but why in BaseClass, there has statement 'import DerivedClass'. This is cross reference which make two classes compiling problem. Actually there are reverse-engineering classes from our previous codes. We need to find out why. If they are in same package, there is no problem but we can't change the package structure (or change the design). If BaseClass is in package hub and DerivedClass is in default package, then DerivedClass extends BaseClass with statement 'import hub.BaseClass'. This is normal. It should not be problem. The stranged is that there is statement 'import DerivedClass' in BasedClass. It is not necessary but I don't know if it is wrong because those classes compile fine. I just don't understand. I hope that you guys catch my points. Thanks.

 

by: objectsPosted on 2004-07-14 at 14:53:40ID: 11554178

what directories are your classes in?

 

by: fredwangusPosted on 2004-07-14 at 18:20:29ID: 11555199

Ok, if we are talking about reverse-engineering, you may want to know whether your reverse tool is reliable or not. I previously reversed some source code and also found some strange code inside.

 

by: objectsPosted on 2004-07-14 at 18:30:20ID: 11555236

> It is not necessary but I don't know if it is wrong because those classes compile fine.

then just remove it :)

 

by: http29Posted on 2004-08-11 at 06:06:58ID: 11772387

I found that in JDK1.4, it no longer supports default package importing. This is the reason why it couldn't compile. But I would accept last comment as my answer since I didn't reply object's effort based on what I learnt recently. Thank you guys.

20120131-EE-VQP-002

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