例如（达里尔）
import java.awt.Color;import java.awt.Dimension;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.GridLayout;import java.awt.Point;import java.awt.Polygon;import java.awt.RenderingHints;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.ArrayList;import java.util.Random;import javax.swing.AbstractAction;import javax.swing.JButton;import javax.swing.Jframe;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.SwingUtilities;import javax.swing.Timer;public class AnimationBackground { public AnimationBackground() { Random random = new Random(); Jframe frame = new Jframe("Animation Background"); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); frame.setResizable(false); final MyJPanel panel = new MyJPanel(); panel.setBackground(Color.BLACK); for (int i = 0; i < 50; i++) { Star star = new Star(new Point(random.nextInt(490), random.nextInt(490))); star.setColor(new Color(100 + random.nextInt(155), 100 + random.nextInt(155), 100 + random.nextInt(155))); star.setxIncr(-3 + random.nextInt(7)); star.setyIncr(-3 + random.nextInt(7)); panel.add(star); } panel.setLayout(new GridLayout(10, 1)); JLabel label = new JLabel("This is a Starry background.", JLabel.CENTER); label.setForeground(Color.WHITE); panel.add(label); JPanel stopPanel = new JPanel(); stopPanel.setOpaque(false); stopPanel.add(new JButton(new AbstractAction("Stop this madness!!") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(ActionEvent e) { panel.stopAnimation(); } })); panel.add(stopPanel); JPanel startPanel = new JPanel(); startPanel.setOpaque(false); startPanel.add(new JButton(new AbstractAction("Start moving...") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(ActionEvent e) { panel.startAnimation(); } })); panel.add(startPanel); frame.add(panel); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { AnimationBackground animationBackground = new AnimationBackground(); } }); } class Star extends Polygon { private static final long serialVersionUID = 1L; private Point location = null; private Color color = Color.YELLOW; private int xIncr, yIncr; static final int WIDTH = 500, HEIGHT = 500; Star(Point location) { int x = location.x; int y = location.y; this.location = location; this.addPoint(x, y + 8); this.addPoint(x + 8, y + 8); this.addPoint(x + 11, y); this.addPoint(x + 14, y + 8); this.addPoint(x + 22, y + 8); this.addPoint(x + 17, y + 12); this.addPoint(x + 21, y + 20); this.addPoint(x + 11, y + 14); this.addPoint(x + 3, y + 20); this.addPoint(x + 6, y + 12); } public void setColor(Color color) { this.color = color; } public void move() { if (location.x < 0 || location.x > WIDTH) { xIncr = -xIncr; } if (location.y < 0 || location.y > WIDTH) { yIncr = -yIncr; } translate(xIncr, yIncr); location.setLocation(location.x + xIncr, location.y + yIncr); } public void setxIncr(int xIncr) { this.xIncr = xIncr; } public void setyIncr(int yIncr) { this.yIncr = yIncr; } public Color getColor() { return color; } } class MyJPanel extends JPanel { private static final long serialVersionUID = 1L; private ArrayList<Star> stars = new ArrayList<Star>(); private Timer timer = new Timer(20, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { for (Star star : stars) { star.move(); } repaint(); } }); public void stopAnimation() { if (timer.isRunning()) { timer.stop(); } } public void startAnimation() { if (!timer.isRunning()) { timer.start(); } } @Override public void addNotify() { super.addNotify(); timer.start(); } @Override public void removeNotify() { super.removeNotify(); timer.stop(); } MyJPanel() { this.setPreferredSize(new Dimension(512, 512)); } public void add(Star star) { stars.add(star); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); for (Star star : stars) { g.setColor(star.getColor()); g.fillPolygon(star); } } }}
