[armedbear-devel] java/abcl hello-world example

[David Dreisigmeyer]

Hi,

I'm new to both abcl and java.  I was wondering if someone could provide a
"hello world" example (the more details the better) where I write the
program in java, create a jar file, and then use that from the repl? An
example of what I'd like to do using Clojure is (see
http://pramode.net/clojure/2010/05/01/clojure-java-interop/ ):

1) counter.java:

package demo
public class counter{
        int c = 0;
        public void increment()
        {
                ++c;
        }
        public int get()
        {
                return c;
        }
        public static int sqr(int x)
        {
                return x*x;
        }
}

2) Using in Clojure:

; To get this to run in SLIME do the following (where we're in demo/ to start):

;;
;; > javac counter.java
;; > cd ../
;; > jar cvf demo.jar demo
;; > mv demo.jar lib/
;;
;; Remember we were in demo/ to start. The directory lib/ is created when we
;; run lein new. So now we have the jar file we created placed with all of the

;; other jar files on the classpath. So we can continue:
;;
;; > lein swank
;;
;; Now start up emacs and M-x slime-connect (accepting 127.0.0.1 and
4005 defaults).
;; At the repl in emacs do
;;
;; user> (import '(demo counter))

;; user> (counter/sqr 4)

Thanks, I really appreciate any help!

-Dave
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