Adding 2 JPanels, different classes

Question

Hi,
I have 3 different classes in 3 files:
public class Trainer {
  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
      f.getContentPane().add(t);
      f.pack();
}...plus...
public class Test extends JPanel {
  public int testing(int n) {
    return 0;
}...and...
public class Game extends Test implements MouseListener, MouseMotionListener {
    Game() {
        setPreferredSize(new Dimension(800, 600));
        addMouseListener(this);
        addMouseMotionListener(this);
(...)I would like to add 2 JPanels side by side to the class "Game". I am not allowed to modify "Test" and "Trainer". Class "Trainer" incorporates the main-method.
How could I do this?
Thanks for your help!

Answer 1

Thanks for your replies, they were really helpful :)
My last question to this topic: I would like to set a background-color for my 2 JPanels - however, the color isn't applied:
    Game() {
        setPreferredSize(new Dimension(800, 600));
        setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
        JPanel actionPanel = new JPanel() { public void paint(Graphics g) {
            actionPanel_paint(g);
        actionPanel.addMouseListener(this);
        actionPanel.addMouseMotionListener(this);
        actionPanel.setBackground(new java.awt.Color(153, 204, 255));
        JPanel statusPanel = new JPanel() { public void paint(Graphics g) {
            statusPanel_paint(g);
        statusPanel.setBackground(new java.awt.Color(204, 255, 204));
        add(actionPanel);
        add(statusPanel);
    public void actionPanel_paint(Graphics g) {
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);       
        Ellipse2D.Double testCircle_action = new Ellipse2D.Double(100, 100, 20, 20);
        g2.setColor(Color.RED);
        g2.draw(testCircle_action);
        g2.fill(testCircle_action);
    public void statusPanel_paint(Graphics g) {
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        Ellipse2D.Double testCircle_status = new Ellipse2D.Double(100, 100, 20, 20);
        g2.setColor(Color.BLACK);
        g2.draw(testCircle_status);
        g2.fill(testCircle_status);
    }