Can't run this bit of code

Question

i cn't get this bit of code to work, it was working fine at home and now when i want to run it on another computer i can't, can anyone help me????
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TestCheckBox extends JPanel
     private JCheckBox cb1,cb2;
     private JComboBox c1;
     private JTextField tf1;
     private ActionHandler h1;
     public void init()
          setLayout(new FLowLayout());
          h1 = new ActionHandler(this);
          String [] s = {"Serif", "SansSerif"};
          c1 = new JComboBox (s);
          c1.addActionListener(h1);
          add(c1);
          Font font = new Font ( c1.getItemAt (0).toString(), Font.Plain, 14);
          tf1 = new JTextField("Test String", 20);
          tf1.setEditable (false);
          tf1.setFont (font);
          add.(tf1);
          cb1 = new JCheckBox ("Bold");
          cb1.addActionListener (h1);
          cb1.setMnemonic('b');
          add(cb1);
          cb2 = new JCheckBox ("Italics");
          cb2.addActionListener(h1);
          cb2.setMnemonic('i');
          add(cb2);
     public void updateFont()
          int valBold, valItalic;
          int fontStyle = tf1.getFont().getStyle();
          int fontSize = tf1.getFont().getSize();
          String fontName = (String) c1.getSelectedItem();
          valBold = cb1.isSelected() ? Font.BOLD : Font.PLAIN;
          valItalic = cb2.isSelected() ? Font.ITALIC : Font.PLAIN;
          fontStyle = valBold + valItalic;
          tf1.setFont(new Font(fontName, fontStyle, fontSize));
          tf1.repaint();
     public static void main (String s[])
          JFrame fr = new JFrame("TestCheckBox");
     class ActionHandler implements ActionListener
          private TestCheckBox tcb;
          public ActionHandler(TestCheckBox T)
          tcb = t;
          public void actionPerformed(ActionEvent e )
          tcb.updateFont();
}

Answer 1

* @(#)TestCheckComboBox.java     Tiger 2005 May 12
package com.yahoo.ron.examples;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
* A Java program that run as an applet and application.
* This test swing checkbox and combobox.
// I hope this helps a little. If theres a problem just make some modification. -author
public class TestCheckComboBox extends JApplet{
     private Font font;
     private class TestPanel extends JPanel{
          private String text = "Test Font";
          TestPanel(){
               setPreferredSize(new Dimension(300, 300));
          public void paint(Graphics g){
               super.paint(g);
               if(font == null) return;
               g.setFont(font);
               FontMetrics fm = g.getFontMetrics(font);
               int x = (getWidth() - fm.stringWidth(text)) / 2;
               int y = (getHeight() - fm.getHeight()) / 2;
               g.drawString(text, x, y);
          void setText(String text){
               if(text != null && text.length() != 0) this.text = text;
     private class ControlPanel extends JPanel implements ItemListener{
          private JCheckBox italics, bold, plain;
          private JComboBox fontSelection;
          private JPanel panel;
          ControlPanel(JPanel panel){
               if(panel != null)
                    this.panel = panel;
               setLayout(new GridLayout(1, 4, 5, 5));
               GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
               add(fontSelection = new JComboBox(ge.getAvailableFontFamilyNames());
               add(bold = new JCheckBox("Bold"));
               add(italics = new JCheckBox("Italics"));
               add(plain = new JCheckBox("Plain"));
               fontSelection.setMaximumRowCount(4);
               fontSelection.addItemListener(this);
               bold.addItemListener(this);
               italics.addItemListener(this);
               plain.addItemListener(this);
               plain.setSelected(true);
          public void itemStateChanged(ItemEvent ie){
               if(panel == null) return;
               String fontName = String.valueOf(fontSelection.getSelectedItem());
               int style = Font.PLAIN;
               if(plain.isSelected()){
                    // do nothing.
               else if(bold.isSelected() && italics.isSelected())
                    style = Font.BOLD + Font.ITALIC;
               else if(bold.isSelected())
                    style = Font.BOLD;
               else if(italics.isSelected())
                    style = Font.ITALIC;
               font = new Font(fontName, style, 14);
               panel.repaint();
     public void init(){
          setPreferredSize(new Dimension(350, 350));
          setLayout(new BorderLayout());
          JPanel tPanel = new TestPanel();
          JPanel cPanel = new ControlPanel(tPanel);
          add(BorderLayout.CENTER, tPanel);
          add(BorderLayout.SOUTH, cPanel);
     static public void main(String[] args){
          JFrame frame = new JFrame("Testing Swing Check Box And Combo Box");
          frame.setPreferredSize(new Dimension(350, 350));
          frame.setLayout(new BorderLayout());
          JPanel tPanel = new TestPanel();
          JPanel cPanel = new ControlPanel(tPanel);
          frame.add(BorderLayout.CENTER, tPanel);
          frame.add(BorderLayout.SOUTH, cPanel);
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setVisible(true);
}