On Tue, Oct 27, 2009 at 1:01 AM, Cristian <super.sgt.pep...@gmail.com> wrote:
>
> I tried overloading -init, but I get the same problem.
>
> java.lang.ClassFormatError: Duplicate field name&signature in class
> file test/gui/button (repl-1:2)
>
> e.g.:
>
> (ns test.gui.button
> (:gen-class
> :extends javax.swing.JButton
> :constructors {[] [String]}
> :init init))
>
> (defn -init
> ([] [["Click me"] nil])
> ([one-arg] [["Click me"] nil]))
I'm not sure what the problem is -- it may be a bug in gen-class,
since the error appears as soon as an :init is specified on this
class:
(ns test.gui.button (:gen-class :init init))
And you don't even need to run any user-supplied code to trigger
it, just mention the class at the REPL:
user=> test.gui.button
java.lang.ClassFormatError: Duplicate field name&signature in class
file test/gui/button (NO_SOURCE_FILE:0)
Fortunately you probably don't need gen-class at all for what
you're trying to do. Actually, I'm not sure why you'd need to
derive from JButton at all; usually it's enough to make one:
(defn click-me-button []
(javax.swing.JButton. "Click me"))
But if you really want to change the behavior, you can often use
'proxy' instead:
(def gui-button
(let [ctor (fn [text]
(proxy [javax.swing.JButton] [text]
(doClick [] (println "my own doClick"))))]
(fn
([] (ctor "Click me"))
([one-arg] (ctor "Click me")))))
user=> (.doClick (gui-button))
my own doClick
Hope that helps,
--Chouser
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