这是一个基本示例，假定类未打包JAR：
// Prepare.String packageName = "com.example.commands";List<Class<ICommand>> commands = new ArrayList<Class<ICommand>>();URL root = Thread.currentThread().getContextClassLoader().getResource(packageName.replace(".", "/"));// Filter .class files.File[] files = new File(root.getFile()).listFiles(new FilenameFilter() { public boolean accept(File dir, String name) { return name.endsWith(".class"); }});// Find classes implementing ICommand.for (File file : files) { String className = file.getName().replaceAll(".class$", ""); Class<?> cls = Class.forName(packageName + "." + className); if (ICommand.class.isAssignableFrom(cls)) { commands.add((Class<ICommand>) cls); }}
