public class Brownain
{ 
  public static void main(String[] args)
  {
	    JFrame box = new JFrame();
	    Container background = box.getContentPane();
	    background.setBackground(new Color(255,250,202));
	    box.setSize(700, 700);
	    box.setTitle("Browniand Motion.");
	    box.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	    
	    
	    Particle particle = new Particle();
	    box.add(particle);
	    box.setVisible(true);
	 
	    ActionListener listener = new Particle(); Does this mean it doesn't update the particle I made earlier but this 'listener' particle?
	 
	   
	    Timer mover = new Timer(25, listener);
	 
	    mover.start();
	 
	  }
	  
} 


  
class Particle extends JComponent implements ActionListener
{
	public Particle()
	{
		rand = new Random();
		xcentre = rand.nextDouble()*600;
		ycentre = rand.nextDouble()*600;
		System.out.println(xcentre);
		particle = new Ellipse2D.Double(xcentre, ycentre, 30, 30);
	}
	
	public double getx()
	{
		return xcentre;
		
	}
	
	public double gety()
	{
		return ycentre;
	}
	
	public double getRadius()
	{
		return radius;
	}
	
	public void actionPerformed(ActionEvent event)
    {
	
		xcentre+=rand.nextGaussian()*10;
		ycentre+=rand.nextGaussian()*10;
		
		particle.setFrame(xcentre,ycentre,radius,radius);
		
		repaint();
	}
	
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		
		Graphics2D g2 = (Graphics2D) g;
		g2.setPaint(Color.PINK);
		
		g2.fill(particle);
		g2.draw(particle);
	}
	
	private double xcentre;
	private double ycentre;
	private double radius;
	private double mass;
	private double xvel;
	private double yvel;
	private Random rand;
	private Ellipse2D.Double particle;
	

}

  for(int i=0; i<50; i++)
	    {
	    	molecule[i] = new Particle();
	    	box.add(molecule[i]);
	    }