java写一个动态的爱心

以下是使用Java Swing编写的动态爱心：

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

public class DynamicHeart extends JPanel implements Runnable {
    private static final long serialVersionUID = 1L;
    private int x, y;
    private ArrayList<Point> points = new ArrayList<>();
    private Thread thread;

    public DynamicHeart() {
        setBackground(Color.BLACK);
        thread = new Thread(this);
        thread.start();
    }

    @Override
    public void run() {
        while (true) {
            int dx = (int) ((Math.random() - 0.5) * 3);
            int dy = (int) ((Math.random() - 0.5) * 3);
            x += dx;
            y += dy;
            if (x < 0 || x > getWidth()) {
                x -= dx;
            }
            if (y < 0 || y > getHeight()) {
                y -= dy;
            }
            Point point = new Point(x, y);
            points.add(point);
            if (points.size() > 50) {
                points.remove(0);
            }
            repaint();
            try {
                Thread.sleep(50);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.RED);
        for (int i = 0; i < points.size(); i++) {
            Point p = points.get(i);
            g.fillOval(p.getX(), p.getY(), 10, 10);
        }
    }

    class Point {
        private int x, y;

        public Point(int x, int y) {
            this.x = x;
            this.y = y;
        }

        public int getX() {
            return x;
        }

        public int getY() {
            return y;
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setSize(500, 500);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new DynamicHeart());
        frame.setVisible(true);
    }
}

运行程序后，会在窗口中生成一个动态的红色爱心。爱心的位置是随机变化的，同时会留下一条轨迹。