JAVA:如何将enter键检测为输入验证的无效输入

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class EnterKeyValidation {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Enter Key Validation");
        JPanel panel = new JPanel();
        JTextField textField = new JTextField(20);
        JButton button = new JButton("Submit");

        // 添加事件监听器
        textField.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                validateInput(textField.getText());
            }
        });

        // 添加按钮点击事件监听器
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                validateInput(textField.getText());
            }
        });

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

    private static void validateInput(String input) {
        if (input.isEmpty()) {
            JOptionPane.showMessageDialog(null, "输入不能为空", "错误", JOptionPane.ERROR_MESSAGE);
        } else {
            JOptionPane.showMessageDialog(null, "输入有效", "成功", JOptionPane.INFORMATION_MESSAGE);
        }
    }
}