Compilation problem with overriding method

Permanently deleted user

创建于 2010年09月22日 17:19

Hi,

I have a class with these 2 methods:

    public Token clone() {
        return clone(this.getAnnotation(), null);
    }

    @Override
    public Token clone(Annotation annot, Map oAllreadyAddedAnnots) {
        return new Token(this, annot); //
    }

The superclass has the following method:

    public abstract AnnotationData clone(Annotation annot, Map oAllreadyAddedAnnots);

class Token is a subclass of AnnotationData.

This does not compile with IntelliJ Idea: the compiler complains, for method clone() in the subclass, that it returns AnnotationData instead of Token. Apparently, the compiler looks at the superclass method with the 2 arguments, not at the method in the subclass.
I agree this is a tricky case, but it does compile in the latest version of Eclipse, using a recent jdk 1.6.
Could IntelliJ Idea be adapted for compiling this? Thanks for your feedback.

3 条评论

Permanently deleted user

创建于 2010年09月23日 07:37

Hi Frederik,

Following code compiles fine for me. Testes under IJ 9.0.3 CE, jdk 1.6:

class AnnotationData {
}

class Token extends AnnotationData {
}

class Annotation {
}

abstract class Base {
    public abstract AnnotationData clone(Annotation annot, Map oAllreadyAddedAnnots);
}

class Sub extends Base {
     public Token clone() {
        return null;
    }

    @Override
    public Token clone(Annotation annot, Map oAllreadyAddedAnnots) {
        return null;
    }
}

Regards, Denis

Permanently deleted user

创建于 2010年09月23日 08:42

Denis,

your code is not the same as mine. Does it still compile if you call the second clone method in the subclass from the first one? So:

class AnnotationData {
}

class Token extends AnnotationData {
}

class Annotation {
}

abstract class Base {
    public abstract AnnotationData clone(Annotation annot, Map oAllreadyAddedAnnots);
}

class Sub extends Base {
     public Token clone() {
        return this.clone(null, null);
     }

    @Override
    public Token clone(Annotation annot, Map oAllreadyAddedAnnots) {
        return null;
    }
}

This won't compile, and I think it should...

Permanently deleted user

创建于 2010年09月23日 08:53

FrederikC wrote:

Denis,

your code is not the same as mine. Does it still compile if you call the second clone method in the subclass from the first one?
...

This won't compile, and I think it should...

Yes, it is compiled fine at IJ 9.0.3 CE, jdk 1.6.

Please provide information about your IntelliJ IDEA version that causes problems and try it with free Community Edition v.9.0.3.

Regards, Denis

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