public   class  ChangeAllFonts {

	 final   static  String[] LIST_ITEMS =
	{ "JList", "with", "new Font" };

	 public   static   void  main (String[] args) {
		 try  {
			// get user's font
			 if  (args.length <  1 ) {
			System.out.println ( 
				"Usage: ChangeAllFonts font-name");
			 return ; 
		} 
		String fontName = args[ 0 ]; 
		Font font =  new  Font (fontName, Font.PLAIN,  12 );

		// put this font in the defaults table for every
		// ui font resource key
		Hashtable defaults = UIManager.getDefaults();
		Enumeration keys = defaults.keys();
		 while  (keys.hasMoreElements()) {

            Object key = keys.nextElement();
			 if  ((key  instanceof  String) &&
				(((String) key).endsWith(".font"))) { 
				System.out.println (key); 
				defaults.put (key, font);
			}
		}

		// now bring up a GUI to show this off
		JPanel panel =  new  JPanel();
		panel.setLayout ( new  BoxLayout (panel, BoxLayout.Y_AXIS));
		panel.add ( new  JLabel ("JLabel with font " + fontName));
		panel.add ( new  JTextField ("JTextField with font " +
		
			fontName)); 
		panel.add ( new  JButton ("JButton with font " +
			fontName));
		JList list =  new  JList (LIST_ITEMS);
		JScrollPane pane =
			 new  JScrollPane (list, 
				ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, 
				ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		panel.add (pane);

			JFrame frame =  new  JFrame ("Changing default fonts");
			frame.setDefaultCloseOperation (WindowConstants.EXIT_ON_CLOSE);
			frame.getContentPane().add(panel);
			frame.pack();
			frame.setVisible(true);
		}  catch  (Exception e) {   
			e.printStackTrace(); 
		} 
	} 
}