Drawing a Image from Thread

Question

I have got application with class extends JPanel. This panel is drawing an Image. here is a code:

public class BackgroundImage extends JPanel{

private BufferedImage img;
private File imageFile;

public BackgroundImage(){
    super();

    Samolot s1 = new Samolot(200,200,new Dimension(15,15));
    s1.start();

    imageFile = new File("C:\\Users\\Katie\\Documents\\Eclipse\\Samolot\\src\\Pics\\img_mapa.jpg");

    try {
        mapa = ImageIO.read(imageFile);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

@Override
public void paintComponent(Graphics g) {
    Graphics2D g2d = (Graphics2D) g;
    g2d.drawImage(img, 0, 0, getWidth(), getHeight(), null);        
}
}

What i want to do is a class ball which will be extends Threads. Each ball will be next thread. Balls need to move, for example from left to right by simply incrementation coordinate int x which defines X-position of created ball. To show that ball is moving i need to draw an image in current coordinates. after changing position, thread repaint ball to next position. What is more i need to add MouseListener to my ball, to not make problem harder after click it need just to System.out.println("somemessage");

My questions: where i need to draw my ball? in class Ball? or BackgroundImage? How it should be look like? where and how add MouseListener to make him works propertly. how to repaint my panel in every cycle of thread.

here is a code of my Ball class:

  class Ball extends Thread {

  // The image to display
  private BufferedImage img;
  private int x;
  private int y;
  Dimension dim;

public void run() {
    super.run();

    try {
        while(x<1000){
            Thread.sleep(300);
            x++;
            System.out.println(x);              
        }
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}
  // Instantiate the panel and perform initialization
  Samolot(int x, int y, Dimension d) {
      this.x = x;
      this.y = y;
      this.dim = d;

    try {
        img = ImageIO.read(new File("C:\\Users\\Katie\\Documents\\Eclipse\\Samolot\\src\\Pics\\img_samolot.png"));
    } catch (IOException e) { }

  }
}

I read that i shouldnt draw anything in other threads then my main thread(here BackgroundImage).

I was thinking about something like that, however it doesnt work:

class Ball:

  class Ball extends JComponent implements Runnable {
MouseListener listener;

public void addListener(MouseListener toAdd) {
    listener = toAdd;
}

  // The image to display
  private BufferedImage img;
  private int x;
  private int y;
  Dimension dim;

public void run() {     
    try {
        while(x<1000){
            Thread.sleep(300);
            x++;
            listener.mouseClicked(new MouseEvent(this, 1, 1, 0, x, y, 1, true)); 
            System.out.println(x);              
        }
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}
  // Instantiate the panel and perform initialization
  Samolot(int x, int y, Dimension d) {
      this.x = x;
      this.y = y;
      this.dim = d;

    try {
        img = ImageIO.read(new File("C:\\Users\\Katie\\Documents\\Eclipse\\Samolot\\src\\Pics\\img_samolot.png"));
    } catch (IOException e) { }

  }
    public BufferedImage getImg(){
        return this.img;
    }
}

Class BackgroundImage:

public class BackgroundImage extends JPanel implements MouseListener{

private BufferedImage mapa;
private File imageFile;
private Ball s1; 
public MapaSwiata(){
    super();

    s1 = new Ball(200,200,new Dimension(15,15));
    Thread t = new Thread(s1);
    t.start();

    imageFile = new File("C:\\Users\\Katie\\Documents\\Eclipse\\Samolot\\src\\Pics\\img_mapa.jpg");

    try {
        mapa = ImageIO.read(imageFile);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

@Override
public void paintComponent(Graphics g) {
    Graphics2D g2d = (Graphics2D) g;
    g2d.drawImage(mapa, 0, 0, getWidth(), getHeight(), null);      
    g2d.drawImage(s1.getImg(), 200, 200, 15, 15, null);
}

@Override
public void mouseClicked(MouseEvent e) {
    // TODO Auto-generated method stub
    System.out.println("message");
}

@Override
public void mouseEntered(MouseEvent e) {
    // TODO Auto-generated method stub

}

@Override
public void mouseExited(MouseEvent e) {
    // TODO Auto-generated method stub

}

@Override
public void mousePressed(MouseEvent e) {
    // TODO Auto-generated method stub

}

@Override
public void mouseReleased(MouseEvent e) {
    // TODO Auto-generated method stub

}
}