java烟花代码

以下是一个简单的 Java 烟花代码示例：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

public class Firework extends JPanel implements ActionListener {
    private static final long serialVersionUID = 1L;
    private Timer timer;
    private ArrayList<Particle> particles;
    private Random random;

    public Firework() {
        setPreferredSize(new java.awt.Dimension(600, 400));
        setBackground(Color.BLACK);

        timer = new Timer(20, this);
        timer.start();

        particles = new ArrayList<>();
        random = new Random();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        particles.add(new Particle(getWidth() / 2, getHeight() - 10, random.nextFloat() * 10 - 5, random.nextFloat() * -10 - 5, random.nextFloat() * 0.2f + 0.1f, random.nextInt(255), random.nextInt(255), random.nextInt(255)));
        for (int i = 0; i < particles.size(); i++) {
            Particle p = particles.get(i);
            p.update();
            if (p.isDead()) {
                particles.remove(i);
                i--;
            }
        }
        repaint();
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        for (Particle p : particles) {
            g.setColor(new Color(p.getRed(), p.getGreen(), p.getBlue()));
            g.fillOval((int) p.getX(), (int) p.getY(), 10, 10);
        }
    }

    private static class Particle {
        private float x, y, vx, vy, life, r, g, b;

        public Particle(float x, float y, float vx, float vy, float life, int r, int g, int b) {
            this.x = x;
            this.y = y;
            this.vx = vx;
            this.vy = vy;
            this.life = life;
            this.r = r;
            this.g = g;
            this.b = b;
        }

        public void update() {
            x += vx;
            y += vy;
            vy += 0.1f;
            life -= 0.01f;
        }

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

        public float getX() {
            return x;
        }

        public float getY() {
            return y;
        }

        public int getRed() {
            return (int) r;
        }

        public int getGreen() {
            return (int) g;
        }

        public int getBlue() {
            return (int) b;
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Firework");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(new Firework());
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

这个程序创建了一个窗口，在其中绘制烟花效果。每个烟花被表示为一个由颜色、位置、速度和寿命组成的粒子。程序每隔一定时间添加一个新的烟花，然后更新和绘制所有粒子。