Java Bouncing Ball

Question

I am trying to write a Java application which draws multiple balls on screen which bounce off of the edges of the frame. I can successfully draw one ball. However when I add

Answer 1

What you need to do is augment your paintComponent method.

Instead of just drawing one ball, you need to loop through them all, and draw each one.

Example:

protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D)g;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    for (Ball b: balls) {
        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
    }
}