Java Swing -计时器中的JTextArea更新不是常量

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

public class TimerExample {
    private JTextArea textArea;
    private Timer timer;
    private int count;

    public TimerExample() {
        JFrame frame = new JFrame("Timer Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        textArea = new JTextArea(10, 20);
        textArea.setEditable(false);
        frame.getContentPane().add(new JScrollPane(textArea));

        timer = new Timer(1000, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                SwingUtilities.invokeLater(new Runnable() {
                    @Override
                    public void run() {
                        count++;
                        textArea.setText("Count: " + count);
                    }
                });
            }
        });

        frame.pack();
        frame.setVisible(true);

        timer.start();
    }

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