How to set Font size in Java application during run time

Hi!

Use a global font object. Something like this:

JFrame createMyDialog(Font font) {
   JLabel label = new JLabel("hello");
   label.setFont(font);
   ...
}

So, when constructing GUI you can set assign the font to all the dialogs:

Font italic = new Font("Dialog", Font.BOLD, 10);
JFrame dialog = createMyDialog(italic);
...

Hope this helps!

Fo global setting a defaults You can use:
ex:

UIDefaults defaults = UIManager.getDefaults();
defaults.put("Label.font", aFont);
defaults.put("List.font", aFont1);
....

For changing at runtime You need to do it manually or create components with this functionality - some kind of settings server.
Each component should on particular event refresh settings from the server.
ex:
class SettingsServer
{
    private static Arraylist settingsListeners = new ArrayList();
    private static Font defaultFont = new Font(....);
    public static void setDefaultFont(Font font)
    {
         defaultFont = font;
         fireSettingsChanged();
    }
    public static Font getDefaultFont()
    {
         return defaultFont;
    }
    public static void fireSettingsChanged()
   {
       //call all registered listeners
   }
   //eed to add listeners managing
   public static void addSettingsListener(ActionListener al);
   public static void removeSettingsListener(ActionListener al);

}
class ULabel extends JLabel
{
    public ULabel()
    {
        super();
        SettingsServer.addSettingsListener(new ActionListener()
        {
              public void actionPerformed(ActionEvent e)
              {
                   setFont(SettingsServer.getDefaultFont);
              }
        });
    }
}

This is an template of proposed solution. It's needed to implement the rest of methods.

UIDefaults defaults = UIManager.getDefaults();
defaults.put("Label.font", aFont);
defaults.put("List.font", aFont1);
......

I'm using Java swing. Can you give me the list of All components that

like for Label : Label.font

similarly  for JTable ?? what ..... for JButton ???

would it be JTable.font ??? or some thing else

setFont() is a method of JComponent. Thus you can use it for all JComponent subclasses (most of the Swing controls). For a complete list see the javadoc (direct known subclasses and futher on):

http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/JComponent.html

Regards!

This code lists all properties in UIDefaults:

UIDefaults d = UIManager.getDefaults();
Enumeration e = d.keys();
while (e.hasMoreElements())
{
    System.out.println(e.nextElement().toString());
}

I suppose that changing those values at runtime will act only on newly created components - components already existing won't be updated.

Thanx it worked . But problem is how to reset the font of existing(visible)  components.
It is setting the font for newly created components.

Thanx