如何使多线程swing gui应用程序用两个按钮启动/停止线程

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class ThreadControlGUI extends JFrame {
    private JButton startButton;
    private JButton stopButton;
    private MyTask task;
    private ExecutorService executor;

    public ThreadControlGUI() {
        startButton = new JButton("Start");
        stopButton = new JButton("Stop");

        startButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                startTask();
            }
        });

        stopButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                stopTask();
            }
        });

        JPanel panel = new JPanel();
        panel.add(startButton);
        panel.add(stopButton);

        add(panel);
        setSize(300, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);

        executor = java.util.concurrent.Executors.newSingleThreadExecutor();
    }

    private void startTask() {
        if (task == null || task.isDone()) {
            task = new MyTask();
            executor.execute(task);
        }
    }

    private void stopTask() {
        if (task != null) {
            task.cancel(true);
        }
    }

    private class MyTask extends SwingWorker<Void, Void> {
        @Override
        protected Void doInBackground() throws Exception {
            while (!isCancelled()) {
                // 执行后台任务
                System.out.println("Task is running...");
                Thread.sleep(1000);
            }
            return null;
        }

        @Override
        protected void done() {
            System.out.println("Task is done.");
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new ThreadControlGUI();
            }
        });
    }
}