如何在java应用程序中编写文本字段的Backspace代码？

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

public class BackspaceExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Backspace Example");
        JTextField textField = new JTextField(20);

        textField.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                if (e.getKeyCode() == KeyEvent.VK_BACK_SPACE) {
                    String text = textField.getText();
                    if (!text.isEmpty()) {
                        textField.setText(text.substring(0, text.length() - 1));
                    }
                }
            }
        });

        frame.getContentPane().add(textField);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }
}