想实现图1的功能，但目前是图二的样子，要怎么改才可以改成图1的样子

Question

package test1;

import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class test5 extends JFrame {

    private JLabel textLabel;
    private JButton italicButton;
    private JButton boldButton;

    public test5() {
        setTitle("Font Changer");
        setSize(400, 300);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        textLabel = new JLabel("Hello World!");
        textLabel.setFont(new Font("Serif", Font.PLAIN, 24));
        panel.add(textLabel);
        italicButton = new JButton("Italic");
        italicButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                
                Font font = textLabel.getFont().deriveFont(Font.ITALIC);
                textLabel.setFont(font);
            }
        });
        panel.add(italicButton);
        boldButton = new JButton("Bold");
        boldButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) { 
                Font font = textLabel.getFont().deriveFont(Font.BOLD);
                textLabel.setFont(font);
            }
        });
        panel.add(boldButton);
        add(panel);
    }

    public static void main(String[] args) {
            test5 fontChanger = new test5();
            fontChanger.setVisible(true);
    }
}

Answer 1

程序修改如下：

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

public class JFrame1 extends JFrame implements ActionListener {

    private JLabel textLabel;
    private JRadioButton italicButton;
    private JRadioButton boldButton;

    public JFrame1() {
        super("Font Changer");
        setSize(400, 300);
        // 创建面板和标签
        JPanel panel = new JPanel(new BorderLayout());
        textLabel = new JLabel("Hello World!", JLabel.CENTER);
        panel.add(textLabel, BorderLayout.CENTER);

        // 创建按钮组和单选按钮，并添加到面板中
        ButtonGroup buttonGroup = new ButtonGroup();
        italicButton = new JRadioButton("ITALIC");
        italicButton.addActionListener(this);
        buttonGroup.add(italicButton);
        boldButton = new JRadioButton("BOLD");
        boldButton.addActionListener(this);
        buttonGroup.add(boldButton);
        JPanel buttonPanel = new JPanel();
        buttonPanel.add(italicButton);
        buttonPanel.add(boldButton);
        panel.add(buttonPanel, BorderLayout.SOUTH);

        // 将面板添加到窗口中，并设置窗口居中显示
        add(panel);
        setLocationRelativeTo(null);
    }

    public void actionPerformed(ActionEvent e) {
        // 根据单选按钮的状态设置标签字体样式
        Font font = textLabel.getFont();
        if (italicButton.isSelected()) {
            font = font.deriveFont(Font.ITALIC);
        } else if (boldButton.isSelected()) {
            font = font.deriveFont(Font.BOLD);
        } else {
            font = font.deriveFont(Font.PLAIN);
        }
        textLabel.setFont(font);
    }

    public static void main(String[] args) {
        JFrame1 fontChanger = new JFrame1();
        fontChanger.setVisible(true);
    }
}