can several seperate paint component classes draw on the one jpanel

[such orb]

i am trying to use good oop practices for my gui game. as the question asks, can you draw seperately on one container?

some code:

@Override
	public void paintComponent(Graphics g) {
		super.paintComponent(g);

		Graphics2D g2 = (Graphics2D) g;
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
				RenderingHints.VALUE_ANTIALIAS_ON);

		g2.setColor(Color.RED);

		g2.fillRoundRect(600, 100, 100, 100, 20, 20);

		g2.setBackground(Color.BLUE);
		g2.setColor(Color.CYAN);
		g2.fillOval(400, 200, 200, 200);

more code:

@Override
	public void paintComponent(Graphics g) {
		super.paintComponent(g);

		Graphics2D g2 = (Graphics2D) g;
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
				RenderingHints.VALUE_ANTIALIAS_ON);

		g2.setColor(Color.RED);

		g2.fillRoundRect(200, 100, 100, 100, 20, 20);

		g2.setBackground(Color.BLUE);
		g2.setColor(Color.CYAN);
		g2.fillOval(700, 200, 200, 200);

when i draw with both classes, only one of the classes actually draws. is there a solution?

thx!

[KevinWorkman]

Not really sure what you're actually doing with that code- an SSCCE would be much better.

You can pass the Graphics instance to whatever method you want, including methods in other classes that contain some rendering logic. You only have to override paintComponent once though.