Subj : Implementing Java Interfaces NOT using Rhino
To   : netscape.public.mozilla.jseng
From : Keno Albrecht
Date : Wed Jul 14 2004 08:30 pm

Hello,

I was wondering how to implement Java interfaces using JavaScript as 
part of a Mozilla extension. Possible solutions seem to work only using 
Rhino, for example, the "default" example

// import some classes from Java.
var Enumeration = java.util.Enumeration;

// an array to enumerate.
var array = [0, 1, 2];

// create an array enumeration.
var elements = new Enumeration() {
    index: 0, elements: array,
    hasMoreElements: function() {
       return (this.index < this.elements.length);
    },
    nextElement: function() {
       return this.elements[this.index++];
    }
};

exits with "missing ; before statement" (pointing to "new Enumeration() 
}", while

// create an array enumeration.
var elements = new Enumeration( {
    index: 0, elements: array,
    hasMoreElements: function() {
       return (this.index < this.elements.length);
    },
    nextElement: function() {
       return this.elements[this.index++];
    }
});

(different braces!) fails with "Java class java.utils.Enumeration is 
abstract and therefore may not be instantiated" :-(.


Well, since this is a really useful feature, I would like to use it 
within my code. Any comments?

Thanks,
Keno

.