Java怎么做跳动的爱心代码

以下是Java实现跳动的爱心代码的示例：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

public class JumpingHeart extends JPanel implements ActionListener {
    private static final long serialVersionUID = 1L;
    private Timer timer;
    private int x, y, dx, dy;
    private Random rand;

    public JumpingHeart() {
        setBackground(Color.BLACK);
        timer = new Timer(50, this);
        timer.start();
        rand = new Random();
        x = rand.nextInt(600) + 50;
        y = rand.nextInt(400) + 50;
        dx = rand.nextInt(10) - 5;
        dy = rand.nextInt(10) - 5;
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Point[] heart = new Point[3];
        heart[0] = new Point(x, y + 20);
        heart[1] = new Point(x + 20, y);
        heart[2] = new Point(x, y - 20);
        g.setColor(Color.RED);
        g.fillPolygon(heart[0].x, heart[0].y, 3);
        g.fillArc(x - 10, y - 20, 20, 40, 0, -180);
    }

    public void actionPerformed(ActionEvent e) {
        x += dx;
        y += dy;
        if (x < 0 || x > getWidth()) {
            dx = -dx;
        }
        if (y < 0 || y > getHeight()) {
            dy = -dy;
        }
        repaint();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Jumping Heart");
        frame.setSize(700, 500);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JumpingHeart heart = new JumpingHeart();
        frame.add(heart);
        frame.setVisible(true);
    }
}

这个程序使用了Java的Swing库来实现图形界面和动画效果。在构造函数中，设置了背景颜色和定时器，并初始化了心形的位置和速度。在paintComponent方法中，绘制了一个心形和一个弧形。在actionPerformed方法中，更新了心形的位置和速度，并检查是否需要改变方向。最后，在main方法中创建了一个窗口，并将心形添加到窗口中显示。