如何在我的代码中添加一个与计时器一起工作的JProgressBar？

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

public class ProgressBarDemo {
    public static void main(String[] args) {
        JFrame frame = new JFrame("JProgressBar Demo");
        frame.setLayout(new BorderLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JProgressBar progressBar = new JProgressBar();
        progressBar.setMinimum(0);
        progressBar.setMaximum(100);

        Timer timer = new Timer(1000, new ActionListener() {
            int progress = 0;

            @Override
            public void actionPerformed(ActionEvent e) {
                if (progress >= 100) {
                    ((Timer) e.getSource()).stop();
                } else {
                    progress++;
                    progressBar.setValue(progress);
                }
            }
        });

        JPanel panel = new JPanel();
        panel.add(progressBar);

        frame.add(panel, BorderLayout.CENTER);
        frame.setSize(300, 200);
        frame.setVisible(true);

        timer.start();
    }
}