Playing with inner classes

[Diancecht]

I was jumping around inner classes. How can you know if an object is an instance of an inner class?

My first thought was looking for the $ character in the class name, as some commercial implementations do.

But I did a concept proof. I declared a class Po$tato and it worked, so no chance.

I the looked at the getDeclaringClass method of class Class, and I think I found the solution there.

So why am I posting this? Mainly to know if anyone had faced this before or if anyone knows about reserved characters on class names.

Cheers,

Dian

 

[sedj]

Why would you care if the class was inner or not Dian ?

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[Diancecht]

Well there's no reason, just playing around.

There's common tecnique that uses inner classes to add event handlers. I was thinking on a way to know if an event has been caught by any of those classes. The reason behind is a bit tricky, it has to do with sending application events before the Swing events that caused them.

I managed to get it work by other means, but then I started being curious about what would happen if I include a $ in a class name.

Now I think that the $ is just a convention and compiler does not make any difference between inner and "outer" classes.

Cheers,

Dian

 

[sedj]

ASFAIK the whole $ thing is just something started by the Sun compiler - but I don't believe its in the compiler spec.

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[Diancecht]

IBM compiler does the same.

The surprise for me is that some Apache utils classes use that $ to determine wether a class is inner or no (don't ask me why)