想用JAVA实现钢琴动画效果

问题遇到的现象和发生背景

如题 想达到像 https://www.xiwnn.com/piano/ 的效果

目前的问题是无法使用第二次线程 只能用一次 想要能重复使用并同时使用这个线程 达到连续的效果 不知道要改repaint还是怎么样的
请教一下各位要怎么改 或是 各位遇到这个题目会如何去实现 感谢各位 !

操作环境、软件版本等信息

JAVA

尝试过的解决方法

目前的程式码

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.ArrayList;
import java.util.EventObject.*;
import java.util.logging.Handler;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

public class FrameTest extends JFrame {
    private final JLabel label1;
    private final JButton button1;
    private final int SCREEN_WIDTH = 1000;
    private final int SCREEN_HEIGHT = 1000;
    private final int LIGHT_ORIGINAL_Y_POS = 910;
    private int lightYPos = LIGHT_ORIGINAL_Y_POS;
    Timer timer;

    public FrameTest() {
        super();
        setLayout(null);
        setTitle("视窗名");
        setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
       
        MouseAdapter handler = new MyMouseAdapter();
        
        label1 = new JLabel("钢琴动画测试");
        label1.setBounds(10, 0, 100, 50);
        add(label1);

        button1 = new JButton("我是白键");
        button1.addMouseListener(handler);
        button1.setBounds(450, 900, 100, 50);
        add(button1);
    }

    public void update(Graphics g) {
        this.paint(g);
    }

    public void paint(Graphics g) {
        super.paint(g);
        g.setColor(Color.red);
        g.fillRect(458, lightYPos, 100, 20);
    }

    public class MyMouseAdapter extends MouseAdapter {
        public void mousePressed(MouseEvent e) {
            System.out.println("mousePressed");
            new Thread(new ActionThread()).start();
            // SwingUtilities.invokeLater(new ActionThread()); 有人告诉我试试看用这个 可是用这个图形无法移动   
     }

        public void mouseReleased(MouseEvent e) {
            System.out.println("mouseReleased");
        }
    }

    private class ActionThread implements Runnable {
        public void run() {
            System.out.print("线程启动\n");
            int i = 1;
            while (true) {
                if (lightYPos < 0) {
                    // thread = null; 
                    break;
                }
                repaint();
                lightYPos -= 5;
                System.out.print(i++ + "\n");
                try {
                    Thread.sleep(10); 
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        }
    }

    public static void main(String[] args) {
        JFrame frameObject = new FrameTest();
        frameObject.setVisible(true);
    }
}