Drawn shapes not displaying on JFrame

Question

I've been trying to write a program where a user clicks a button that will ask the user for an int input, and that will draw a new circle and display it on a new JFrame. No matter what I do, it won't show up on the JFrame, and I have to no idea what to do anymore. Here is the circle class. A lot of it is commented out because I don't know what to do.

I have an actionListener in my main class for a button called circle and it can call other methods and print things from the circle class if I add methods, but the shape won't draw. Any advice on what I'm doing wrong?

package shapecreator;

import javax.swing.*;
import java.awt.*;

public class Circle extends JPanel {

    private int diameter;
    private int x, y, w, h;

    public Circle(){
      //String radius = JOptionPane.showInputDialog("Enter the diameter");
      //diameter = Integer.parseInt(radius);
      //this.diameter = d;
      //setCircleDimensions(d);
      //this.diameter = d;   

      repaint();

      //repaint();
    }

    public void setDimensions(int x1, int y1, int w1, int h1) {
      this.x = x1;
      this.y = y1;
      this.w = w1;
      this.h = h1;

      repaint();
    }

    /*public void setCircleDimensions(int d) {
        this.diameter = d;
    }*/


    @Override
    protected void paintComponent(Graphics g) {
      super.paintComponent(g);
      String radius = JOptionPane.showInputDialog("Enter the diameter");
      diameter = Integer.parseInt(radius);
      g.fillOval(100, 200, diameter, diameter);
    }

    @Override
    public Dimension getPreferredSize() {
        if (isPreferredSizeSet()) {
            return super.getPreferredSize();
        }
        return new Dimension(850, 600);
    }

    public void display() {
      JFrame f = new JFrame();
      f.setBounds(200, 200, 850, 600);
      f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
      f.setLocationRelativeTo(null);
      f.setVisible(true);
    }

}

        circle.addActionListener((ActionEvent e) -> {
        String radius = JOptionPane.showInputDialog("Enter the diameter");
        int d = Integer.parseInt(radius);
        Circle c = new Circle();
        c.setDimensions(100, 100, d, d);
        c.repaint();
        c.display();
        //c.setCircleDimensions(100, 100, d);
        //c.repaint();
        //resultsPanel.add(c);
        //frame.add(c);*/
    });