如何在按下按钮后使用自己的ActionListener类将文本追加到JTextArea

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

public class MyActionListener implements ActionListener {
    private JTextArea textArea;

    public MyActionListener(JTextArea textArea) {
        this.textArea = textArea;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        String newText = "This is a new text.";
        textArea.append(newText);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Button Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JTextArea textArea = new JTextArea();
        textArea.setEditable(false);

        JButton button = new JButton("Append Text");
        button.addActionListener(new MyActionListener(textArea));

        frame.getContentPane().add(textArea);
        frame.getContentPane().add(button);

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