import java.awt.*; public class Main {         public static void main(String[] args) {                 Frame frame = new Frame("满天星");                 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);         } }