CirclePanel

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;

import javax.swing.JPanel;

@SuppressWarnings("serial")
public class CirclePanel extends JPanel {
	public static final Dimension SIZE = new Dimension(35, 35);

	public CirclePanel() {
	}

    @Override
    protected void paintComponent(Graphics g) {
    	g.setColor(Color.RED);
    	g.fillOval(0, 0, 35, 35);
    	System.out.println(getSize());
    }

    @Override
    public Dimension getPreferredSize() {
    	return SIZE;
    }
}