Graphics 2D - How do I call my method as it takes (Graphics) as parameter

Question

I'm trying to make some custom fields/circles, but I can't figure out how to call my method, as it needs to take Graphics as a parameter.

I'm already using the standard paint() and paintComponent() in other methods and do not want to move these fields inside one of those.

I've tried to make a ''new'' object like I would do with scanner, arraylist etc., but it is not possible and I can't seem to find anything on how to do so - Is it not even possible? If not, how are you guys calling your methods then?

public void paintFields(Graphics g){
                Graphics2D g2d = (Graphics2D) g;
                g2d.setColor(LightBlue);
                g2d.setStroke(new BasicStroke(5));
                g2d.drawOval(300,300,300,300);

Overview of the code in THIS class, maybe it gives a better understanding. I have a MyFrame dc = new MyFrame(); in another class which sets the underneath class in action

public class MyFrame extends JPanel {
        //color for fields
        Color lightRed = new Color(255,100,100);
        Color lightYellow = new Color(255,255,150);
        Color LightBlue = new Color(170,220,255);
        //attribute for fields (location, size, rotation)
        int xc = 300, yc = 200, r = 100, diam = 25;
        double inc = Math.PI/360, theta = 0, theta2 = 0;


        public MyFrame () {
                Timer timer = new Timer(0, event -> { //set a delay for printing
                        theta = theta + inc;
                        repaint();
                        theta2 = theta2 + inc;
                        repaint();
                }); //Anonymoous class
                timer.start();
        }

        @Override
        public void paint(Graphics g) {
                super.paintComponent(g);
                Graphics2D g2d = (Graphics2D) g;

                g2d.rotate(theta2, xc, yc);
                g2d.setColor(LightBlue);
                g2d.setStroke(new BasicStroke(5));
                g2d.drawOval(xc + r - diam / 2, yc + r - diam / 2, diam, diam);
        }

        public void fields(Graphics g){
                Graphics2D g2d = (Graphics2D) g;
                g2d.setColor(LightBlue);
                g2d.setStroke(new BasicStroke(5));
                g2d.drawOval(300,300,300,300);
        }
}