My JButton stays on the screen after being pressed

Question

My JButton's code is here:

JButton b = new JButton("JButton");
b.setBounds(100, 100, 100, 50);
b.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent arg0) {
        g.setColor(Color.BLACK);
        g.fillRect(0, 0, 1000, 500);
    }
});
frame.add(b);

This should make my screen go black after my button is pressed, but the button just stays on my JFrame. I can't find what is going wrong with this JButton, as I have in the past.
Another error I am encountering is that my JButton takes up the whole screen, even though I set its bounds to be a specific area.

Answer 1

You probably degine the Graphics g before the JButton b, thus the JButton is always displayed on the top layer.

You have to explicitely hide the button on the click action using the setVisible(false) method.

b.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent arg0) {
        b.setVisible(false);
        g.setColor(Color.BLACK);
        g.fillRect(0, 0, 1000, 500);
    }
});