Jeu avec java

public class Cadre extends java.awt.Component
{
    private static final long serialVersionUID = 1;
    
    @Override
    public void paint(java.awt.Graphics g)
    {
        super.paint(g);
        g.drawOval(0, 0, getWidth(), getHeight());
    }
}

public class Test
{
    public static void main(String[] args)
    {
        Cadre cadre = new Cadre();
        
        javax.swing.JFrame frame = new javax.swing.JFrame();
        frame.add(cadre);
        frame.setSize(200+16,200+38);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
    }
}