http://snippets.dzone.com/posts Mon, 06 Oct 2008 16:53:32 GMT DZone Snippets: introspection code http://snippets.dzone.com/posts/show/4831 The code below gets all classes within a given package. Notice that it should only work for classes found locally, getting really ALL classes is impossible. <br /> <br /><code> <br /> /** <br /> * Scans all classes accessible from the context class loader which belong to the given package and subpackages. <br /> * <br /> * @param packageName The base package <br /> * @return The classes <br /> * @throws ClassNotFoundException <br /> * @throws IOException <br /> */ <br /> private static Class[] getClasses(String packageName) <br /> throws ClassNotFoundException, IOException { <br /> ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); <br /> assert classLoader != null; <br /> String path = packageName.replace('.', '/'); <br /> Enumeration<URL> resources = classLoader.getResources(path); <br /> List<File> dirs = new ArrayList<File>(); <br /> while (resources.hasMoreElements()) { <br /> URL resource = resources.nextElement(); <br /> dirs.add(new File(resource.getFile())); <br /> } <br /> ArrayList<Class> classes = new ArrayList<Class>(); <br /> for (File directory : dirs) { <br /> classes.addAll(findClasses(directory, packageName)); <br /> } <br /> return classes.toArray(new Class[classes.size()]); <br /> } <br /> <br /> /** <br /> * Recursive method used to find all classes in a given directory and subdirs. <br /> * <br /> * @param directory The base directory <br /> * @param packageName The package name for classes found inside the base directory <br /> * @return The classes <br /> * @throws ClassNotFoundException <br /> */ <br /> private static List<Class> findClasses(File directory, String packageName) throws ClassNotFoundException { <br /> List<Class> classes = new ArrayList<Class>(); <br /> if (!directory.exists()) { <br /> return classes; <br /> } <br /> File[] files = directory.listFiles(); <br /> for (File file : files) { <br /> if (file.isDirectory()) { <br /> assert !file.getName().contains("."); <br /> classes.addAll(findClasses(file, packageName + "." + file.getName())); <br /> } else if (file.getName().endsWith(".class")) { <br /> classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6))); <br /> } <br /> } <br /> return classes; <br /> } <br /></code> Fri, 30 Nov 2007 15:28:48 GMT http://snippets.dzone.com/posts/show/4831 vtatai (Victor Tatai) http://snippets.dzone.com/posts/show/269 <code> <br />dir(obj) <br />vars(obj) <br />obj.__dict__ <br /></code> <br /> <br />There are more information when call it again with <br />obj.__class__ and klass.__bases__ Wed, 11 May 2005 16:24:55 GMT http://snippets.dzone.com/posts/show/269 korakot (Korakot Chaovavanich)