用java写一个烟花绽放的代码

以下是使用 Java 编写的烟花绽放的代码示例：

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

public class Fireworks extends JPanel implements Runnable {
    private ArrayList<Particle> particles = new ArrayList<Particle>();
    private Point explosionPos;
    private boolean exploded = false;

    public Fireworks() {
        setBackground(Color.BLACK);
        setDoubleBuffered(true);
    }

    public void run() {
        try {
            Thread.sleep(3000); // Wait for 3 seconds before exploding
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        explode();
        while (true) {
            update();
            repaint();
            try {
                Thread.sleep(15);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private void explode() {
        explosionPos = new Point(getWidth() / 2, getHeight() / 2);
        for (int i = 0; i < 200; i++) {
            particles.add(new Particle(explosionPos));
        }
        exploded = true;
    }

    private void update() {
        if (exploded) {
            for (int i = particles.size() - 1; i >= 0; i--) {
                Particle p = particles.get(i);
                if (p.shouldRemove()) {
                    particles.remove(i);
                } else {
                    p.update();
                }
            }
            if (particles.size() == 0) {
                exploded = false;
            }
        }
    }

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.WHITE);
        for (Particle p : particles) {
            p.draw(g);
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Fireworks");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500, 500);
        Fireworks fireworks = new Fireworks();
        frame.add(fireworks);
        frame.setVisible(true);
        new Thread(fireworks).start();
    }

    private class Particle {
        private Point pos;
        private int size;
        private Color color;
        private int dx, dy;
        private int life;

        public Particle(Point pos) {
            this.pos = new Point(pos);
            size = (int) (Math.random() * 5) + 5;
            color = new Color((int) (Math.random() * 256), (int) (Math.random() * 256), (int) (Math.random() * 256));
            dx = (int) (Math.random() * 5) - 2;
            dy = (int) (Math.random() * 5) - 2;
            life = (int) (Math.random() * 30) + 30;
        }

        public void update() {
            pos.x += dx;
            pos.y += dy;
            life--;
        }

        public boolean shouldRemove() {
            return life <= 0;
        }

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

这个程序实现了一个简单的烟花效果，包括烟花绽放和粒子的运动。在程序运行时，它将等待 3 秒钟，然后烟花将绽放并开始运动。运行过程中，粒子会逐渐消失