import javax.swing.*; import java.awt.*; public class MoonFrame extends JFrame{ public MoonFrame(){ MoonPanel panel=new MoonPanel(); Thread th=new Thread(panel); th.start(); this.add(panel); } public void showMe(){ this.setTitle("月食"); this.setSize(800,600); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setLocationRelativeTo(null); this.setVisible(true); } public static void main(String[] args) { // TODO Auto-generated method stub MoonFrame mf=new MoonFrame(); mf.showMe(); } } import javax.swing.*; import java.awt.*; public class DrawStarFrame extends JFrame { public void showMe(){ this.setTitle("满天星"); this.setSize(1000,600); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setLocationRelativeTo(null); //this.setResizable(false); DrawStarPanel panel=new DrawStarPanel(); this.add(panel); this.setVisible(true); } /** * @param args */ 

public static void main(String[] args) { // TODO Auto-generated method stub DrawStarFrame ds=new DrawStarFrame(); ds.showMe(); } } import javax.swing.*; import java.awt.*; public class DrawStarPanel extends JPanel{ public void paint(Graphics g){ super.paint(g); this.setBackground(Color.BLACK); g.setColor(Color.yellow); Font font=new Font("宋体",Font.BOLD,20); g.setFont(font); for(int i=0;i<500;i++){ g.drawString("★", (int)(Math.random()*1000),(int) (Math.random()*600)); } g.fillOval(650, 100, 80, 80); g.setColor(Color.BLACK); g.fillOval(630, 80, 70, 80); } }