###### tags: `Xerovit - Notes` # Interview ## API Response Status Codes * 200 * 201 * 301 * 400 * 401 * 403 * 404 * 500 ## HTTP Methods * PUT * DELETE * GET * POST ```java= // Write Code Here class User { public String userName; } class App { public static void main(String... args) { User user = new User(); System.out.println(user.userName); updateName(user); System.out.println(user.userName); } public static void updateName(User u) { u.userName = "Testing"; } } ```