无法从Clojure调用实例方法。

Question

I'm completely new to Java and clojure. But with previous experience in common lisp, I thought I would give clojure a try. I'm unable to figure out few very basic things.

This is the actual Java code.

import syntaxtree.*;
import visitor.*;

public class Main {
    public static void main(String [] args) {
    try {
        Node root = new MicroJavaParser(System.in).Goal();
        System.out.println("Program parsed successfully");
    }
    catch (ParseException e) {
        System.out.println(e.toString());
    }
    }
} 

When I run this code, the outcome is as expected.

└──╼ java Main < ../input/Factorial.java 
Program parsed successfully

In Clojure I tried this :

(ns clj-assign2.core)

(defn -main
  []
  (def root
    (.Goal
     (MicroJavaParser. (. System in))))
  (println "Successfully parsed"))

But when this code is run, the following exception is raised :

└──╼ lein run < ../assign2/input/Factorial.java 
Exception in thread "main" java.lang.IllegalArgumentException: No matching field found: Goal for class MicroJavaParser
    at clojure.lang.Reflector.getInstanceField(Reflector.java:271)
    at clojure.lang.Reflector.invokeNoArgInstanceMember(Reflector.java:300)
    at clj_assign2.core$_main.invoke(core.clj:7)
< --- snipped --- >

What am I doing wrong here?

Answer 1

也许您的Clojure程序中缺少导入语句？