写一段Java烟花代码

以下是一段简单的Java烟花代码：

import java.awt.Color;
import java.awt.Graphics;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Fireworks extends JPanel implements Runnable {

    private static final long serialVersionUID = 1L;
    private ArrayList<Particle> particles;
    private Random rand;
    private int width, height;

    public Fireworks(int width, int height) {
        this.width = width;
        this.height = height;
        particles = new ArrayList<Particle>();
        rand = new Random();
    }

    public void run() {
        while (true) {
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            if (rand.nextInt(100) < 10) {
                particles.add(new Particle(rand.nextInt(width), height));
            }
            for (int i = 0; i < particles.size(); i++) {
                Particle p = particles.get(i);
                if (p.isDead()) {
                    particles.remove(i);
                } else {
                    p.update();
                }
            }
            repaint();
        }
    }

    public void paint(Graphics g) {
        g.setColor(Color.BLACK);
        g.fillRect(0, 0, width, height);
        for (Particle p : particles) {
            p.draw(g);
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Fireworks");
        Fireworks fireworks = new Fireworks(800, 600);
        frame.add(fireworks);
        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        new Thread(fireworks).start();
    }

}

class Particle {

    private int x, y, vx, vy, age, maxAge;
    private Color color;

    public Particle(int x, int y) {
        this.x = x;
        this.y = y;
        vx = (int) (Math.random() * 10) - 5;
        vy = (int) (Math.random() * -20) - 10;
        age = 0;
        maxAge = (int) (Math.random() * 100) + 100;
        color = new Color((int) (Math.random() * 255), (int) (Math.random() * 255), (int) (Math.random() * 255));
    }

    public void update() {
        x += vx;
        y += vy;
        vy += 1;
        age++;
    }

    public void draw(Graphics g) {
        g.setColor(color);
        g.fillOval(x, y, 5, 5);
    }

    public boolean isDead() {
        return age >= maxAge;
    }

}

这段代码实现了一个简单的烟花效果，每隔一段时间会产生一个新的烟花，烟花会向上运动并产生许多彩色的粒子。