Need help making ball move and bounce off of sides of JPanel

[adlb1300]

I'm currently working on a program that creates a ball of random color. I'm trying to make the ball move around the JPanel it is contained in and if it hits a wall it should bounce off of it. I have been able to draw the ball and make it fill with a random color. However, I cannot get it to move around and bounce off the walls. Below is the code for the class that creates the ball. Should I possible be using multithreads? Any help would be appreciated.

Thanks

Code:

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;

public class Ball extends JPanel{
    
    Graphics g;
    int rval; // red color value
    int gval; // green color value
    int bval; // blue color value
    private int x = 1;
    private int y = 1;
    private int dx = 2;
    private int dy = 2;
    
    public void paintComponent(Graphics g){
        
        for(int counter = 0; counter < 100; counter++){
            // randomly chooses red, green and blue values changing color of ball each time
            rval = (int)Math.floor(Math.random() * 256);
            gval = (int)Math.floor(Math.random() * 256);
            bval = (int)Math.floor(Math.random() * 256);
            
            
            super.paintComponent(g);
            g.drawOval(0,0,30,30);   // draws circle
            g.setColor(new Color(rval,gval,bval)); // takes random numbers from above and creates RGB color value to be displayed
            g.fillOval(x,y,30,30); // adds color to circle
            move(g);
            
            
        }
    } // end paintComponent
    
    public void move(Graphics g){
        
        g.fillOval(x, y, 30, 30);
        x += dx;
        y += dy;
        if(x < 0){
            x = 0;
            dx = -dx;
        }
        if (x + 30 >= 400) {
            x = 400 - 30;
            dx = -dx;
        }
        if (y < 0) {
            y = 0;
            dy = -dy;
        }
        if (y + 30 >= 400) {
            y = 400 - 30;
            dy = -dy;
        }
        g.fillOval(x, y, 30, 30);
        g.dispose();
        
    }   
} // end Ball class

[hardwired]

Code:

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

public class BallMoves extends JPanel implements Runnable {
    Color color = Color.red;
    int dia = 30;
    long delay = 40;
    private int x = 1;
    private int y = 1;
    private int dx = 3;
    private int dy = 2;
    
    protected void paintComponent(Graphics g){
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        g.setColor(color); 
        g.fillOval(x,y,30,30);   // adds color to circle
        g.setColor(Color.black);
        g2.drawOval(x,y,30,30);   // draws circle
    }

    public void run() {
        while(isVisible()) {
            try {
                Thread.sleep(delay);
            } catch(InterruptedException e) {
                System.out.println("interrupted");
            }
            move();
            repaint();
        }
    }
    
    public void move() {
        if(x + dx < 0 || x + dia + dx > getWidth()) {
            dx *= -1;
            color = getColor();
        }
        if(y + dy < 0 || y + dia + dy > getHeight()) {
            dy *= -1;
            color = getColor();
        }
        x += dx;
        y += dy;
    }

    private Color getColor() {
        int rval = (int)Math.floor(Math.random() * 256);
        int gval = (int)Math.floor(Math.random() * 256);
        int bval = (int)Math.floor(Math.random() * 256);
        return new Color(rval, gval, bval);
   }

    private void start() {
        while(!isVisible()) {
            try {
                Thread.sleep(25);
            } catch(InterruptedException e) {
                System.exit(1);
            }
        }
        Thread thread = new Thread(this);
        thread.setPriority(Thread.NORM_PRIORITY);
        thread.start();
    }

    public static void main(String[] args) {
        BallMoves test = new BallMoves();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(test);
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
        test.start();
    }
}

[adlb1300]

Thanks Hardwired for the help. Animating objects is very new to me. This is the first time I had to do in programming. I appreciate the time you have taken to help out a beginner like myself.