Changing implementation on runtime with cmd

I have a database and an interface, let's call it Updater. The updater is stored in the Timer class and will be invoked once a day to update my database.

 DailyUpdater updater;

    public ProductUpdatingTimer(DailyUpdater updater) {
        this.updater = updater;
    }

    public void changeUpdater(DailyUpdater updater) {
        this.updater = updater;
    }

    public void start() {
        TimerTask repeatedTask = new TimerTask() {
            public void run() {
                System.out.println("Task performed on " + new Date());
                updater.update();
            }
        };
        Timer timer = new Timer("Timer");
        long delay = 1000L;
        long period = 1000L * 600L;//this period is used for testing 
        timer.scheduleAtFixedRate(repeatedTask, delay, period);
    }

Now let's imagine I need to change the behavior of my updater and switch to another implementation with a command from cmd.

Is it possible to do it with some kind of proxy class and listener of command line events? And if yes, would this approach considered 'clean soulution?