import java.awt.*;
class Main
{
    static public void main( String[] args )
    {
        Frame f = new Frame( "paint Example" );
        f.add("center", new MainCanvas());
        f.resize(200,100);
        f.show();
    }
}
class MainCanvas extends Canvas
{
    public void paint(Graphics g)
    {
        g.drawOval(0, 0, size().width, size().height);
    }
}