请给出java中在窗体设置字体选择菜单的程序代码，要包括多种字体样式

以下是一个简单的 Java 程序，可以在窗体中设置字体选择菜单，并支持多种字体样式：

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

public class FontChooser extends JFrame implements ActionListener {
    private JComboBox fontBox;
    private JComboBox styleBox;
    private JComboBox sizeBox;
    private JLabel previewLabel;

    public FontChooser() {
        super("Font Chooser");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Create the font selection controls
        String[] fontNames = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
        fontBox = new JComboBox(fontNames);
        fontBox.addActionListener(this);

        String[] styleNames = {"Plain", "Bold", "Italic", "Bold Italic"};
        styleBox = new JComboBox(styleNames);
        styleBox.addActionListener(this);

        String[] sizeNames = {"8", "9", "10", "11", "12", "14", "16", "18", "20", "22", "24", "26", "28", "36", "48", "72"};
        sizeBox = new JComboBox(sizeNames);
        sizeBox.addActionListener(this);

        // Create the preview label
        previewLabel = new JLabel("The quick brown fox jumps over the lazy dog.");
        previewLabel.setHorizontalAlignment(JLabel.CENTER);
        previewLabel.setVerticalAlignment(JLabel.CENTER);
        previewLabel.setFont(new Font((String)fontBox.getSelectedItem(), styleBox.getSelectedIndex(), Integer.parseInt((String)sizeBox.getSelectedItem())));

        // Create the layout
        JPanel controlPanel = new JPanel(new GridLayout(1, 3));
        controlPanel.add(fontBox);
        controlPanel.add(styleBox);
        controlPanel.add(sizeBox);

        JPanel previewPanel = new JPanel(new BorderLayout());
        previewPanel.add(previewLabel, BorderLayout.CENTER);

        setLayout(new BorderLayout());
        add(controlPanel, BorderLayout.NORTH);
        add(previewPanel, BorderLayout.CENTER);

        // Set the initial window size and show the window
        setSize(400, 200);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        previewLabel.setFont(new Font((String)fontBox.getSelectedItem(), styleBox.getSelectedIndex(), Integer.parseInt((String)sizeBox.getSelectedItem())));
    }

    public static void main(String[] args) {
        new FontChooser();
    }
}

这个程序使用了 Java 的 Swing 库，创建了一个窗体，包含了字体选择菜单和一个预览标签。当用户改变任何一个字体选择选项时，程序会更新预览标签的字体。