list java/lang public classes in a jar file

gistfile1.java

    public static void main(String args[]) throws IOException, ClassNotFoundException {
        JarFile jarFile = new JarFile("/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Classes/classes.jar");
        Enumeration allEntries = jarFile.entries();
        while (allEntries.hasMoreElements()) {
            JarEntry entry = (JarEntry) allEntries.nextElement();
            String name = entry.getName();
            if (name.startsWith("java/lang") && !name.substring(10).contains("/") && !name.contains("$")) {
                int value = JarDir.class.getClassLoader().loadClass(name.substring(0, name.length() - 6).replace("/", ".")).getModifiers();
                if (Modifier.isPublic(value)) {
                    System.out.print(name.substring(10,name.length()-6) + "|");
                }
            }
        }
        System.out.println("");
    }