public class Main {
        public static void main(String[] args) {
                Frame frame = new Frame("滿天星");
                MyPanel panel = new MyPanel();
                frame.add(panel);
                frame.setBackground(Color.BLACK);
                frame.setSize(1024, 768);
                frame.setVisible(true);
        }
}

class MyPanel extends Panel {
        private static final long serialVersionUID = 1L;

        public void paint(Graphics g) {
                g.setColor(Color.WHITE);
                for (int i = 0; i < 300; i++) {
                        g.drawString("*", (int) (Math.random() * 1024),
                                        (int) (Math.random() * 768));
                }
                g.fillOval(800, 100, 100, 100);
                g.setColor(Color.BLACK);
                g.fillOval(780, 80, 100, 100);

        }

}