Can you extend a Java class, and add new fields and constructors to it?

[Didier]

Hi,

I'm trying to see if you can extend a Java class in Clojure, in a way that lets you add class members (fields) and new constructor methods.

I'm pretty sure you can not with reify, since that only works on interfaces and protocol, but I'm thinking there should be a way to do so with proxy maybe?

Thanks.

[Erik Assum]

Not sure that this is exactly what you're asking for, but it might still give you a starting point:

https://github.com/wjoel/clj-bean

Erik. 

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i farta

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[Mars0i]

gen-class lets you define multiple constructors: http://stackoverflow.com/questions/18780071/clojure-multiple-constructors-using-gen-class

You can't define multiple fields that can be directed accessed from Java, but you can define accessors for data you store in other ways. gen-class gives you only a single variable that's specific to each instance of the class, but you can e.g. put a map in it, with atoms as values if you need mutability, and define the accessors to access those.

(If you have a lot of variables that you're handling that way, you may want to write a gen-class-generating macro. That's what I did, but it's not general; it's tailored to my application.)