public IRubyObject append(IRubyObject obj) throws Exception 
{
        String ss = obj.convertToString().toString();
        URL url = getURL(ss);
        getRuntime().getJRubyClassLoader().addURL(url);
        return this;
}

 public static  void createClassPathVariable(Ruby runtime) 
{
        RubyClassPathVariable self = new RubyClassPathVariable(runtime);
        runtime.getEnumerable().extend_object(self);
        runtime.defineReadonlyVariable("$CLASSPATH", self);
        self.getMetaClass().defineAnnotatedMethods(RubyClassPathVariable.class);
}

 public IRubyObject each(Block block) 
{
        URL[] urls = getRuntime().getJRubyClassLoader().getURLs();
        ThreadContext ctx = getRuntime().getCurrentContext();
        for(int i=0,j=urls.length;i< j;i++) {
            block.yield(ctx, getRuntime().newString(urls[i].toString()));
        }
        return getRuntime().getNil();
}

 public IRubyObject inspect() 
{
        return callMethod(getRuntime().getCurrentContext(), "to_a").callMethod(getRuntime().getCurrentContext(), "inspect");
}

 public IRubyObject size() 
{
        return getRuntime().newFixnum(getRuntime().getJRubyClassLoader().getURLs().length);
}

 public IRubyObject to_s() 
{
        return callMethod(getRuntime().getCurrentContext(), "to_a").callMethod(getRuntime().getCurrentContext(), "to_s");
}