How to add mouselistener on random drawn image in java?

I am building a game in Java and I need to add a mouselistener to an random drawn image in my game.

I made the image appear on random places every x seconds, when I click the image I would like to add 1 point to the scoreboard.

My code for the random image adding is:

Random rand = new Random();
private int x = 0;
private int y = 0;

Timer timer = new Timer(700, new ActionListener(){
    @Override
    public void actionPerformed(ActionEvent e) {
        x = rand.nextInt(400);
        y = rand.nextInt(330);
        repaint();
    }
});

public void mousePressed (MouseEvent me) {
       // Do something here
       repaint();
     }

public void paintComponent(Graphics g) {
    super.paintComponent(g);

    g.drawImage(achtergrond, 0, 0, this.getWidth(), this.getHeight(), null);
    //g.drawImage(muisje, 10, 10, null);
    g.drawImage(muisje, x, y, 100, 100, this);
}

I looked on google and found that I need to add a new class with a mouse event, but How do I add this? It's not clear enough because I'm just a beginner in Java.

You need to register a MouseListener for your Gamevenster class. Instead of making the class implement MouseListener, just use a MouseAdapter, where you only have to implement the method mouseClicked. So in your constructor, you something like this

private JLabel scoreLabel = new JLabel("Score: " + score);
private int score = 0;

public Gamevenster() {
    scoreLabel.setFont(new Font("impact", Font.PLAIN, 30));
    scoreLabel.setForeground(Color.WHITE);
    add(scoreLabel);

    addMouseListener(new MouseAdapter(){
        @Override
        public void mouseClicked(MouseEvent e) {
            Point p = e.getPoint();
            int clickX = (int)p.getX();
            int clickY = (int)p.getY();

            if(clickX > x && clickX < x + 100 && clickY > y && clickY  < y + 100) {
                score++;
                scoreLabel.setText("Score: " + score);
            }
        }
    });
}