Renderer

import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JPanel;
public class Renderer extends JPanel
{
    static final long serialVersionUID = 1L;

    @Override
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Pong.pong.render((Graphics2D) g);
    }
}