Change Font at runtime

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);
    }
}