class ClasspathBuilder {

        static String build(List<URL> classpathElements) {<FILL_FUNCTION_BODY>}

        private static File toFile(URL element) {
            try {
                return new File(element.toURI());
            } catch (URISyntaxException ex) {
                throw new IllegalArgumentException(ex);
            }
        }

    }

            StringBuilder classpath = new StringBuilder();
            for (URL element : classpathElements) {
                if (classpath.length() > 0) {
                    classpath.append(File.pathSeparator);
                }
                classpath.append(toFile(element));
            }
            return classpath.toString();
        
<no_super_class>