用java写一个跳动的爱心

以下是用 Java Swing 实现的跳动爱心代码：

import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;

public class HeartAnimation extends JPanel {
    private static final long serialVersionUID = 1L;
    private static final int HEART_WIDTH = 50;
    private static final int HEART_HEIGHT = 50;
    private static final int DELTA = 5;

    private int x = 0;
    private int y = 0;
    private int dx = DELTA;
    private int dy = DELTA;

    public HeartAnimation() {
        Timer timer = new Timer(30, e -> {
            x += dx;
            y += dy;
            if (x < 0 || x + HEART_WIDTH > getWidth()) {
                dx = -dx;
            }
            if (y < 0 || y + HEART_HEIGHT > getHeight()) {
                dy = -dy;
            }
            repaint();
        });
        timer.start();
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        int cx = x + HEART_WIDTH / 2;
        int cy = y + HEART_HEIGHT / 2;
        Ellipse2D.Double ellipse1 = new Ellipse2D.Double(x, y, HEART_WIDTH / 2, HEART_HEIGHT / 2);
        Ellipse2D.Double ellipse2 = new Ellipse2D.Double(cx, y, HEART_WIDTH / 2, HEART_HEIGHT / 2);
        GeneralPath path = new GeneralPath();
        path.moveTo(x, cy);
        path.curveTo(x, y - HEART_HEIGHT / 4, cx - HEART_WIDTH / 4, y, cx, y);
        path.curveTo(cx + HEART_WIDTH / 4, y, x + HEART_WIDTH, y - HEART_HEIGHT / 4, x + HEART_WIDTH, cy);
        path.curveTo(x + HEART_WIDTH, y + HEART_HEIGHT / 4, cx + HEART_WIDTH / 4, y + HEART_HEIGHT, cx, y + HEART_HEIGHT);
        path.curveTo(cx - HEART_WIDTH / 4, y + HEART_HEIGHT, x, y + HEART_HEIGHT / 4, x, cy);
        g2d.setColor(Color.RED);
        g2d.fill(ellipse1);
        g2d.fill(ellipse2);
        g2d.fill(path);
        g2d.dispose();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Heart Animation");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 300);
        frame.setLocationRelativeTo(null);
        frame.setContentPane(new HeartAnimation());
        frame.setVisible(true);
    }
}

运行后会出现一个窗口，里面有一个跳动的爱心，可以通过改变 DELTA 常量的值来改变爱心的移动速度。