java小球运动，和线程有关

Question

这里的小球其实就是下雨时的雨点
题目要求各种颜色的小球像下雨一样降落，速度可以调整

Answer 1

该回答引用ChatGPT
首先，您需要定义一个类来表示每个小球，并将其坐标以及速度储存在对象中。然后，您可以创建多个对象来代表不同颜色的小球，并通过每次绘图操作来更新小球的位置。下面是一个简单的实现

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

public class Raindrop extends JPanel {

    private static final long serialVersionUID = 1L;
    private ArrayList<Ball> balls;
    private int width;
    private int height;
    private int speed;

    public Raindrop(int width, int height, int speed) {
        this.width = width;
        this.height = height;
        this.speed = speed;
        setPreferredSize(new Dimension(width, height));
        balls = new ArrayList<Ball>();
    }

    public void addBall(Color color, int x, int y, int speed) {
        balls.add(new Ball(color, x, y, speed));
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        for (Ball ball : balls) {
            ball.update();
            g.setColor(ball.getColor());
            g.fillOval(ball.getX(), ball.getY(), 20, 20);
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        Raindrop raindrop = new Raindrop(500, 500, 1);
        raindrop.addBall(Color.BLUE, 50, 50, 1);
        raindrop.addBall(Color.RED, 100, 100, 2);
        raindrop.addBall(Color.GREEN, 150, 150, 3);
        frame.add(raindrop);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        while (true) {
            raindrop.repaint();
            try {
                Thread.sleep(16);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    class Ball {

        private Color color;
        private int x;
        private int y;
        private int speed;

        public Ball(Color color, int x, int y, int speed) {
            this.color = color;
            this.x = x;
            this.y = y;
            this.speed = speed;