//client
private static void menu(Client client) throws IOException, InterruptedException, ClassNotFoundException {
    reader = new BufferedReader(new InputStreamReader(System.in));
    String clientCommand = null;
    String serverOutput;
    try {
        clientCommand = reader.readLine();
    } catch (IOException e) {
    }
    switch (clientCommand) {
        case "1":
            oos.writeUTF(clientCommand);
            Student newStudent = createNewStudent();
            oos.writeObject(newStudent);
            oos.flush();
            Thread.sleep(1000);
            serverOutput = (String) ois.readObject();
            System.out.println(serverOutput);
            menu(client);
            break;
        // ...
    }
}

public static Student createNewStudent() {
    Scanner in = new Scanner(System.in);
    String name = in.nextLine();
    System.out.println("faculty: ");
    String faculty = in.nextLine();
    Student student = new Student(name, faculty);
    return student;
}

//server
public void serverHandler() {
    try {
        Socket socket = server.accept();
        ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
        ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
        while (!socket.isClosed()) {
            String message = (String) ois.readObject();
            if (message.equalsIgnoreCase("1")) {
                Student s = (Student) ois.readObject();
                archive.add(s);
                oos.writeObject("the student has been added");
                oos.flush();
            }
        }
        //close etc..
    }
}