如何用JTextField和JButton制作一个具有名称填充功能的菜单？

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

JFrame frame = new JFrame("名称填充菜单");
frame.setLayout(new FlowLayout());

JTextField textField = new JTextField("请输入名称", 20);

JButton button = new JButton("填充");

button.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        String name = "默认名称"; // 默认名称
        textField.setText(name); // 将名称填充到文本框中
    }
});

frame.add(textField);
frame.add(button);

frame.setSize(300, 100);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

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

public class NameFillMenu {
    public static void main(String[] args) {
        JFrame frame = new JFrame("名称填充菜单");
        frame.setLayout(new FlowLayout());

        JTextField textField = new JTextField("请输入名称", 20);

        JButton button = new JButton("填充");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String name = "默认名称"; // 默认名称
                textField.setText(name); // 将名称填充到文本框中
            }
        });

        frame.add(textField);
        frame.add(button);

        frame.setSize(300, 100);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}