Java Graphics2D hjälp.

import javax.swing.*;
import java.awt.*;

public class Game extends JFrame{
	Graphics2D g2d;
	Ball ball = new Ball();
	
	
	// Threads
	Thread gameloop;
	boolean gameRunning;
	
	public static void main(String [] args){new Game();}
	
	public void paint(Graphics g){
		//Background
		g.setColor(Color.BLUE);
		g.fillRect(0, 0, getSize().width, getSize().height);
	}
	
	public Game() {
	
		//GUI
		setVisible(true);
		setDefaultCloseOperation(3);
		setSize(520,600);
		setResizable(false);
		setLocationRelativeTo(null);
		
		ball.draw(g2d);
	}
}

import java.awt.*;

public class Ball{
	public void draw (Graphics2D g2d) {
		g2d.setColor(Color.RED);
		g2d.fillOval(50,50, 100, 100);
	}
	
}