/* RadioB.java
   An applet to illustrate event handling with interactive
   radio buttons that control the font style of a text field
   */
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;

public class RadioB extends JApplet implements ItemListener {

// Make most of the variables class variables, because both init
// and the event handler must see them

    private Container contentPane = getContentPane();
    private JTextField text;
    private Font plainFont, boldFont, italicFont, boldItalicFont;
    private JRadioButton plain, bold, italic, boldItalic;
    private ButtonGroup radioButtons = new ButtonGroup();
    private JPanel myPanel = new JPanel();
   
// The init method is where the document is initially built

    public void init() {

// Set the background color of the panel

        myPanel.setBackground(Color.cyan);

// Create the fonts

        plainFont = new Font("Serif", Font.PLAIN, 16);
        boldFont = new Font("Serif", Font.BOLD, 16);
        italicFont = new Font("Serif", Font.ITALIC, 16);
        boldItalicFont = new Font("Serif", Font.BOLD +
                                   Font.ITALIC, 16);

// Create the test text string, set its font, and add it to the 
// panel

        text = new JTextField("In what font style should I appear?", 
                             30);
        myPanel.add(text);
        text.setFont(plainFont);

 // Create radio buttons for the fonts and add them to the panel

        plain = new JRadioButton("Plain", true);
        bold = new JRadioButton("Bold");
        italic = new JRadioButton("Italic");
        boldItalic = new JRadioButton("Bold Italic");
        radioButtons.add(plain);
        radioButtons.add(bold);
        radioButtons.add(italic);
        radioButtons.add(boldItalic);

// Register the event handlers to myPanel
        plain.addItemListener(this);
        bold.addItemListener(this);
        italic.addItemListener(this);
        boldItalic.addItemListener(this);

// Now add the buttons to the panel

        myPanel.add(plain);
        myPanel.add(bold);
        myPanel.add(italic);
        myPanel.add(boldItalic);

// Now add the panel to the content pane for the applet

        contentPane.add(myPanel);

    }  // End of init()

// The event handler

    public void itemStateChanged (ItemEvent e) {

// Determine which button is on and set the font accordingly

if (plain.isSelected())
    text.setFont(plainFont);
else if (bold.isSelected())
   text.setFont(boldFont);
else if (italic.isSelected())
   text.setFont(italicFont);
else if (boldItalic.isSelected())
   text.setFont(boldItalicFont);

    } // End of itemStateChanged 

} // End of RadioB applet