在运行时更改字体 [英] Change Font at runtime

问题描述

请问是否还有另外一种方法，在运行时改变Font作为使用FontUIResource，整个AWT / Swing GUI，而没有任何关于JComponents的局部变量和类型的知识/兴趣

$ b $ $ $ $ $ $ $ $ import import java.awt。*;
import java.awt.event。*;
import java.util.Locale;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing。*;
import javax.swing.plaf.FontUIResource;
import javax.swing.plaf.basic.BasicComboBoxRenderer;

public class SystemFontDisplayer extends JFrame {

private static final long serialVersionUID = 1L;
private JFrame frame = new JFrame（Nimbus UIDeafaults and Font）;
私人JComboBox fontsBox;
private javax.swing.Timer timer = null;
private JButton testButton = new JButton（testButton）;
private JTextField testTextField = new JTextField（testTextField）;
private JLabel testLabel = new JLabel（testLabel）;
$ b $ public SystemFontDisplayer（）{
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment（）;
String [] fontFamilyNames = ge.getAvailableFontFamilyNames（Locale.getDefault（））;
fontsBox = new JComboBox（fontFamilyNames）;
fontsBox.setSelectedItem（0）;
fontsBox.setRenderer（new ComboRenderer（））;
（new ItemListener（）{

@Override
public void itemStateChanged （）;
final String fontName = fontsBox.getSelectedItem（）。toString（）;
fontsBox.setFont（new Font（fontName，Font.PLAIN，16））;
start（）;
}
}
}）;
fontsBox.setSelectedItem（0）;
fontsBox.getEditor（）。selectAll（）;
frame.setLayout（new GridLayout（4，0，20，20））;
frame.add（fontsBox）;
frame.add（testButton）;
frame.add（testTextField）;
frame.add（testLabel）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
frame.setLocation（200，105）;
frame.pack（）;
java.awt.EventQueue.invokeLater（new Runnable（）{

@Override
public void run（）{
fontsBox.setPopupVisible（true）;
fontsBox.setPopupVisible（false）;
}
}）;
frame.setVisible（true）;

$ b $ private void start（）{
timer = new javax.swing.Timer（750，updateCol（））;
timer.setRepeats（false）;
timer.start（）;

$ b $ public updateCol（）{
return new AbstractAction（text load action）{

private static final long serialVersionUID = 1L;
$ b @Override
public void actionPerformed（ActionEvent e）{
final Font fnt = new Font（fontsBox.getSelectedItem（）。toString（），Font.PLAIN，12）;
/ * try {
LookAndFeel lnf = UIManager.getLookAndFeel（）。getClass（）。newInstance（）;
final FontUIResource res = new FontUIResource（fnt）;
UIDefaults uiDefaults = lnf.getDefaults（）;
uiDefaults.put（Button.font，res）;
uiDefaults.put（TextField.font，res）;
uiDefaults.put（Label.font，res）;
UIManager.getLookAndFeel（）。uninitialize（）;
UIManager.setLookAndFeel（lnf）;
} catch（InstantiationException ex）{
Logger.getLogger（SystemFontDisplayer.class.getName（））。log（Level.SEVERE，null，ex）;
catch（IllegalAccessException ex）{
Logger.getLogger（SystemFontDisplayer.class.getName（））。log（Level.SEVERE，null，ex）;
} catch（UnsupportedLookAndFeelException ex）{
Logger.getLogger（SystemFontDisplayer.class.getName（））。log（Level.SEVERE，null，ex）;
}
UIDefaults defaults = UIManager.getDefaults（）;
final FontUIResource res = new FontUIResource（fnt）;
defaults.put（Button.font，res）;
defaults.put（TextField.font，res）;
defaults.put（Label.font，res）;
SwingUtilities.updateComponentTreeUI（frame）; * /
final FontUIResource res = new FontUIResource（fnt）;
UIManager.getLookAndFeelDefaults（）。put（Button.font，res）;
UIManager.getLookAndFeelDefaults（）。put（TextField.font，res）;
UIManager.getLookAndFeelDefaults（）。put（Label.font，res）;
SwingUtilities.updateComponentTreeUI（frame）;
}
}; （UIManager.LookAndFeelInfo laf：UIManager.getInstalledLookAndFeels（））{b

$ b public static void main（String arg []）{
/ * try {

if（Nimbus.equals（laf.getName（）））{
UIManager.setLookAndFeel（laf.getClassName（））;

$ b} catch（Exception e）{
e.printStackTrace（）;
} * /
java.awt.EventQueue.invokeLater（new Runnable（）{
$ b $ @Override
public void run（）{
SystemFontDisplayer systemFontDisplayer = new SystemFontDisplayer（）;
}
}）;


private class ComboRenderer extends BasicComboBoxRenderer {

private static final long serialVersionUID = 1L;

@Override
public Component getListCellRendererComponent（JList list，Object value，int index，boolean isSelected，boolean cellHasFocus）{
super.getListCellRendererComponent（list，value，index，isSelected， cellHasFocus）;
final Object fntObj = value;
final String fontFamilyName =（String）fntObj;
setFont（new Font（fontFamilyName，Font.PLAIN，16））;
返回这个;





$ p

编辑：我发表了叙述与Nimbus，然后代码为Nimbus

  import java.awt 。*; 
 import java.awt.event。*; 
 import java.util.Locale; 
 import java.util.logging.Level; 
 import java.util.logging.Logger; 
 import javax.swing。*; 
 import javax.swing.plaf.FontUIResource; 
 import javax.swing.plaf.basic.BasicComboBoxRenderer; 
 
 public class SystemFontDisplayer extends JFrame {
 
 private static final long serialVersionUID = 1L; 
 private JFrame frame = new JFrame（Nimbus UIDeafaults and Font）; 
私人JComboBox fontsBox; 
 private javax.swing.Timer timer = null; 
 private JButton testButton = new JButton（testButton）; 
 private JTextField testTextField = new JTextField（testTextField）; 
 private JLabel testLabel = new JLabel（testLabel）; 
 $ b $ public SystemFontDisplayer（）{
 GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment（）; 
 String [] fontFamilyNames = ge.getAvailableFontFamilyNames（Locale.getDefault（））; 
 fontsBox = new JComboBox（fontFamilyNames）; 
 fontsBox.setSelectedItem（0）; 
 fontsBox.setRenderer（new ComboRenderer（））; 
（new ItemListener（）{
 
 @Override 
 public void itemStateChanged （）; 
 final String fontName = fontsBox.getSelectedItem（）。toString（）; 
 fontsBox.setFont（new Font（fontName，Font.PLAIN，16））; 
 start（）; 
} 
} 
}）; 
 fontsBox.setSelectedItem（0）; 
 fontsBox.getEditor（）。selectAll（）; 
 frame.setLayout（new GridLayout（4，0，20，20））; 
 frame.add（fontsBox）; 
 frame.add（testButton）; 
 frame.add（testTextField）; 
 frame.add（testLabel）; 
 frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 frame.setLocation（200，105）; 
 frame.pack（）; 
 java.awt.EventQueue.invokeLater（new Runnable（）{
 
 @Override 
 public void run（）{
 fontsBox.setPopupVisible（true）; 
 fontsBox.setPopupVisible（false）; 
} 
}）; 
 frame.setVisible（true）; 
 
 $ b $ private void start（）{
 timer = new javax.swing.Timer（750，updateCol（））; 
 timer.setRepeats（false）; 
 timer.start（）; 
 
 $ b $ public updateCol（）{
 return new AbstractAction（text load action）{
 
 private static final long serialVersionUID = 1L; 
 $ b @Override 
 public void actionPerformed（ActionEvent e）{
 final Font fnt = new Font（fontsBox.getSelectedItem（）。toString（），Font.PLAIN，12）; 
尝试{
 LookAndFeel lnf = UIManager.getLookAndFeel（）。getClass（）。newInstance（）; 
 final FontUIResource res = new FontUIResource（fnt）; 
 UIDefaults uiDefaults = lnf.getDefaults（）; 
 uiDefaults.put（Button.font，res）; 
 uiDefaults.put（TextField.font，res）; 
 uiDefaults.put（Label.font，res）; 
 UIManager.getLookAndFeel（）。uninitialize（）; 
 UIManager.setLookAndFeel（lnf）; 
} catch（InstantiationException ex）{
 Logger.getLogger（SystemFontDisplayer.class.getName（））。log（Level.SEVERE，null，ex）; 
 catch（IllegalAccessException ex）{
 Logger.getLogger（SystemFontDisplayer.class.getName（））。log（Level.SEVERE，null，ex）; 
} catch（UnsupportedLookAndFeelException ex）{
 Logger.getLogger（SystemFontDisplayer.class.getName（））。log（Level.SEVERE，null，ex）; 
} 
 UIDefaults defaults = UIManager.getDefaults（）; 
 final FontUIResource res = new FontUIResource（fnt）; 
 defaults.put（Button.font，res）; 
 defaults.put（TextField.font，res）; 
 defaults.put（Label.font，res）; 
 SwingUtilities.updateComponentTreeUI（frame）; 
 / * final FontUIResource res = new FontUIResource（fnt）; 
 UIManager.getLookAndFeelDefaults（）。put（Button.font，res）; 
 UIManager.getLookAndFeelDefaults（）。put（TextField.font，res）; 
 UIManager.getLookAndFeelDefaults（）。put（Label.font，res）; 
 SwingUtilities.updateComponentTreeUI（frame）; * / 
} 
}; （UIManager.LookAndFeelInfo laf：UIManager.getInstalledLookAndFeels（））{
 
 
 $ b public static void main（String arg []）{
 try {
 $ b if（Nimbus.equals（laf.getName（）））{
 UIManager.setLookAndFeel（laf.getClassName（））; 
 
 $ b} catch（Exception e）{
 e.printStackTrace（）; 
 
 java.awt.EventQueue.invokeLater（new Runnable（）{
 $ b $ @Override 
 public void run（）{
 SystemFontDisplayer systemFontDisplayer = new SystemFontDisplayer（）; 
} 
}）; 
 
 
 private class ComboRenderer extends BasicComboBoxRenderer {
 
 private static final long serialVersionUID = 1L; 
 
 @Override 
 public Component getListCellRendererComponent（JList list，Object value，int index，boolean isSelected，boolean cellHasFocus）{
 super.getListCellRendererComponent（list，value，index，isSelected， cellHasFocus）; 
 final Object fntObj = value; 
 final String fontFamilyName =（String）fntObj; 
 setFont（new Font（fontFamilyName，Font.PLAIN，16））; 
返回这个; 
 
 
 
 
 $ div class =h2_lin>解决方案 
 
 
这个简单的应用程序将按照系列创建一个字体列表，并将其应用于JButton和JTextField。
  import javax.swing。*; 
 import java.awt。*; 
 import java.awt.event。*; 
 import java.io. *; 
 / ** 
 FontSwitcher 
 
 @作者Stefan Wagner 
 @date所以13. Mai 03:25:23 CEST 2012 
 * / 
 public class FontSwitcher extends JFrame implements ActionListener 
 {
 private static final String progname =FontSwitcher 0.1; 
 
私人JTextField反馈; 
私人JButton jb; 
 private JList fontList; 
 
 public FontSwitcher（）
 {
 super（progname）; 
 JPanel mainpanel = new JPanel（）; 
 mainpanel.setLayout（new BorderLayout（））; 
 this.getContentPane（）.add（mainpanel）; 
 
 GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment（）; 
 String [] fonts = ge.getAvailableFontFamilyNames（）; 
 fontList = new JList（fonts）; 
 JScrollPane js = new JScrollPane（fontList）; 
 
 feedback = new JTextField（Feedback）; 
 jb = new JButton（apply font）; 
 jb.addActionListener（this）; 
 mainpanel.add（feedback，BorderLayout.NORTH）; 
 mainpanel.add（js，BorderLayout.CENTER）; 
 mainpanel.add（jb，BorderLayout.SOUTH）; 
 
 setSize（400，800）; 
 setLocation（100，100）; 
 setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 setVisible（true）; 
 
 $ b $ public void actionPerformed（final ActionEvent e）
 {
 SwingWorker worker = new SwingWorker（）
 {
 protected String doInBackground ）throws InterruptedException 
 {
 String cmd = e.getActionCommand（）; 
 if（cmd.equals（apply font））
 {
 String selectedFont = fontList.getSelectedValue（）.toString（）; 
 Font font = new Font（selectedFont，Font.TRUETYPE_FONT，14）; 
 jb.setFont（font）; 
 feedback.setFont（font）; 
} 
返回done; 
 
 protected void done（）
 {
 feedback.setText（done）; 
} 
}; 
 worker.execute（）; 
 
 
 public static void main（final String args []）
 {
 Runnable runner = new Runnable（）
 {
 public void run（）
 {
 new FontSwitcher（）; 
} 
}; 
 EventQueue.invokeLater（runner）; 
} 
} 
  
 
Please is there another way how to change Font at runtime as using FontUIResource, for the whole AWT/Swing GUI, without any knowledge / interest about if there are local variables and type of JComponents

import java.awt.*;
import java.awt.event.*;
import java.util.Locale;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import javax.swing.plaf.FontUIResource;
import javax.swing.plaf.basic.BasicComboBoxRenderer;

public class SystemFontDisplayer extends JFrame {

    private static final long serialVersionUID = 1L;
    private JFrame frame = new JFrame("Nimbus UIDeafaults and Font");
    private JComboBox fontsBox;
    private javax.swing.Timer timer = null;
    private JButton testButton = new JButton("testButton");
    private JTextField testTextField = new JTextField("testTextField");
    private JLabel testLabel = new JLabel("testLabel");

    public SystemFontDisplayer() {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        String[] fontFamilyNames = ge.getAvailableFontFamilyNames(Locale.getDefault());
        fontsBox = new JComboBox(fontFamilyNames);
        fontsBox.setSelectedItem(0);
        fontsBox.setRenderer(new ComboRenderer());
        fontsBox.addItemListener(new ItemListener() {

            @Override
            public void itemStateChanged(ItemEvent e) {
                if (e.getStateChange() == ItemEvent.SELECTED) {
                    final String fontName = fontsBox.getSelectedItem().toString();
                    fontsBox.setFont(new Font(fontName, Font.PLAIN, 16));
                    start();
                }
            }
        });
        fontsBox.setSelectedItem(0);
        fontsBox.getEditor().selectAll();
        frame.setLayout(new GridLayout(4, 0, 20, 20));
        frame.add(fontsBox);
        frame.add(testButton);
        frame.add(testTextField);
        frame.add(testLabel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocation(200, 105);
        frame.pack();
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                fontsBox.setPopupVisible(true);
                fontsBox.setPopupVisible(false);
            }
        });
        frame.setVisible(true);
    }

    private void start() {
        timer = new javax.swing.Timer(750, updateCol());
        timer.setRepeats(false);
        timer.start();
    }

    public Action updateCol() {
        return new AbstractAction("text load action") {

            private static final long serialVersionUID = 1L;

            @Override
            public void actionPerformed(ActionEvent e) {
                final Font fnt = new Font(fontsBox.getSelectedItem().toString(), Font.PLAIN, 12);
                /*try {
                    LookAndFeel lnf = UIManager.getLookAndFeel().getClass().newInstance();
                    final FontUIResource res = new FontUIResource(fnt);
                    UIDefaults uiDefaults = lnf.getDefaults();
                    uiDefaults.put("Button.font", res);
                    uiDefaults.put("TextField.font", res);
                    uiDefaults.put("Label.font", res);
                    UIManager.getLookAndFeel().uninitialize();
                    UIManager.setLookAndFeel(lnf);
                } catch (InstantiationException ex) {
                    Logger.getLogger(SystemFontDisplayer.class.getName()).log(Level.SEVERE, null, ex);
                } catch (IllegalAccessException ex) {
                    Logger.getLogger(SystemFontDisplayer.class.getName()).log(Level.SEVERE, null, ex);
                } catch (UnsupportedLookAndFeelException ex) {
                    Logger.getLogger(SystemFontDisplayer.class.getName()).log(Level.SEVERE, null, ex);
                }
                UIDefaults defaults = UIManager.getDefaults();
                final FontUIResource res = new FontUIResource(fnt);
                defaults.put("Button.font", res);
                defaults.put("TextField.font", res);
                defaults.put("Label.font", res);
                SwingUtilities.updateComponentTreeUI(frame);*/
                final FontUIResource res = new FontUIResource(fnt);
                UIManager.getLookAndFeelDefaults().put("Button.font", res);
                UIManager.getLookAndFeelDefaults().put("TextField.font", res);
                UIManager.getLookAndFeelDefaults().put("Label.font", res);
                SwingUtilities.updateComponentTreeUI(frame);
            }
        };
    }

    public static void main(String arg[]) {
        /*try {
            for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(laf.getName())) {
                    UIManager.setLookAndFeel(laf.getClassName());
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }*/
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                SystemFontDisplayer systemFontDisplayer = new SystemFontDisplayer();
            }
        });
    }

    private class ComboRenderer extends BasicComboBoxRenderer {

        private static final long serialVersionUID = 1L;

        @Override
        public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
            super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
            final Object fntObj = value;
            final String fontFamilyName = (String) fntObj;
            setFont(new Font(fontFamilyName, Font.PLAIN, 16));
            return this;
        }
    }
}
.

EDIT: I posted narrative with Nimbus, then code for Nimbus 
import java.awt.*;
import java.awt.event.*;
import java.util.Locale;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import javax.swing.plaf.FontUIResource;
import javax.swing.plaf.basic.BasicComboBoxRenderer;

public class SystemFontDisplayer extends JFrame {

    private static final long serialVersionUID = 1L;
    private JFrame frame = new JFrame("Nimbus UIDeafaults and Font");
    private JComboBox fontsBox;
    private javax.swing.Timer timer = null;
    private JButton testButton = new JButton("testButton");
    private JTextField testTextField = new JTextField("testTextField");
    private JLabel testLabel = new JLabel("testLabel");

    public SystemFontDisplayer() {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        String[] fontFamilyNames = ge.getAvailableFontFamilyNames(Locale.getDefault());
        fontsBox = new JComboBox(fontFamilyNames);
        fontsBox.setSelectedItem(0);
        fontsBox.setRenderer(new ComboRenderer());
        fontsBox.addItemListener(new ItemListener() {

            @Override
            public void itemStateChanged(ItemEvent e) {
                if (e.getStateChange() == ItemEvent.SELECTED) {
                    final String fontName = fontsBox.getSelectedItem().toString();
                    fontsBox.setFont(new Font(fontName, Font.PLAIN, 16));
                    start();
                }
            }
        });
        fontsBox.setSelectedItem(0);
        fontsBox.getEditor().selectAll();
        frame.setLayout(new GridLayout(4, 0, 20, 20));
        frame.add(fontsBox);
        frame.add(testButton);
        frame.add(testTextField);
        frame.add(testLabel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocation(200, 105);
        frame.pack();
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                fontsBox.setPopupVisible(true);
                fontsBox.setPopupVisible(false);
            }
        });
        frame.setVisible(true);
    }

    private void start() {
        timer = new javax.swing.Timer(750, updateCol());
        timer.setRepeats(false);
        timer.start();
    }

    public Action updateCol() {
        return new AbstractAction("text load action") {

            private static final long serialVersionUID = 1L;

            @Override
            public void actionPerformed(ActionEvent e) {
                final Font fnt = new Font(fontsBox.getSelectedItem().toString(), Font.PLAIN, 12);
                try {
                    LookAndFeel lnf = UIManager.getLookAndFeel().getClass().newInstance();
                    final FontUIResource res = new FontUIResource(fnt);
                    UIDefaults uiDefaults = lnf.getDefaults();
                    uiDefaults.put("Button.font", res);
                    uiDefaults.put("TextField.font", res);
                    uiDefaults.put("Label.font", res);
                    UIManager.getLookAndFeel().uninitialize();
                    UIManager.setLookAndFeel(lnf);
                } catch (InstantiationException ex) {
                    Logger.getLogger(SystemFontDisplayer.class.getName()).log(Level.SEVERE, null, ex);
                } catch (IllegalAccessException ex) {
                    Logger.getLogger(SystemFontDisplayer.class.getName()).log(Level.SEVERE, null, ex);
                } catch (UnsupportedLookAndFeelException ex) {
                    Logger.getLogger(SystemFontDisplayer.class.getName()).log(Level.SEVERE, null, ex);
                }
                UIDefaults defaults = UIManager.getDefaults();
                final FontUIResource res = new FontUIResource(fnt);
                defaults.put("Button.font", res);
                defaults.put("TextField.font", res);
                defaults.put("Label.font", res);
                SwingUtilities.updateComponentTreeUI(frame);
                /*final FontUIResource res = new FontUIResource(fnt);
                UIManager.getLookAndFeelDefaults().put("Button.font", res);
                UIManager.getLookAndFeelDefaults().put("TextField.font", res);
                UIManager.getLookAndFeelDefaults().put("Label.font", res);
                SwingUtilities.updateComponentTreeUI(frame);*/
            }
        };
    }

    public static void main(String arg[]) {
        try {
            for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(laf.getName())) {
                    UIManager.setLookAndFeel(laf.getClassName());
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                SystemFontDisplayer systemFontDisplayer = new SystemFontDisplayer();
            }
        });
    }

    private class ComboRenderer extends BasicComboBoxRenderer {

        private static final long serialVersionUID = 1L;

        @Override
        public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
            super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
            final Object fntObj = value;
            final String fontFamilyName = (String) fntObj;
            setFont(new Font(fontFamilyName, Font.PLAIN, 16));
            return this;
        }
    }
}

解决方案
For instance: Create a new Font from the FontFamily list, and apply it to your component with c.setFont (font);

A second approach is, to search for TTF-Files (for example), and create new Fonts with the static method Font.createFont (new File ("...")); 

This simple app will create a List of Fonts by family, and apply it to a JButton and JTextField.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
/**
    FontSwitcher

    @author Stefan Wagner
    @date So 13. Mai 03:25:23 CEST 2012    
*/
public class FontSwitcher extends JFrame implements ActionListener
{
    private static final String progname = "FontSwitcher 0.1";

    private JTextField feedback;
    private JButton jb;
    private JList fontList;

    public FontSwitcher ()
    {
        super (progname);
        JPanel mainpanel = new JPanel ();
        mainpanel.setLayout (new BorderLayout ());
        this.getContentPane ().add (mainpanel);

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment ();
        String [] fonts = ge.getAvailableFontFamilyNames ();
        fontList = new JList (fonts);
        JScrollPane js = new JScrollPane (fontList);

        feedback = new JTextField ("Feedback");
        jb = new JButton ("apply font");
        jb.addActionListener (this);
        mainpanel.add (feedback, BorderLayout.NORTH);
        mainpanel.add (js, BorderLayout.CENTER);
        mainpanel.add (jb, BorderLayout.SOUTH);

        setSize (400, 800);
        setLocation (100, 100);
        setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
        setVisible (true);
    }

    public void actionPerformed (final ActionEvent e)
    {
        SwingWorker worker = new SwingWorker () 
        {
            protected String doInBackground () throws InterruptedException 
            {
                String cmd = e.getActionCommand ();
                if (cmd.equals ("apply font"))
                {
                    String selectedFont = fontList.getSelectedValue ().toString ();
                    Font font = new Font (selectedFont, Font.TRUETYPE_FONT, 14);
                    jb.setFont (font);
                    feedback.setFont (font);
                }
                return "done";
            }
            protected void done () 
            {
                feedback.setText ("done");
            }
        };
        worker.execute ();
    }

    public static void main (final String args[])
    {
        Runnable runner = new Runnable () 
        {
            public void run () 
            {
                new FontSwitcher ();
            }
        };
        EventQueue.invokeLater (runner);
    }
}


                        
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