package radiobuttontest;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JRadioButton;
import javax.swing.ButtonGroup;
class RadioButtonFrame extends JFrame{
    private JTextField textField;
    private Font plaintFont;
    private Font boldFont;
    private Font boldItalicFonte;
    private JRadioButton plainJRadioButton;
    private JRadioButton boldJRadioButton;
    private JRadioButton ItalicJRadioButton;
    private JRadioButton boldItalicJRadioButton;
    private ButtonGroup radioGroup;
    private final Font plainFont;
    private final Font italicFont;
    private final Font boldItalicFont;
    public RadioButtonFrame(){
        super ("RadioButton Test");
        setLayout (new FlowLayout());
        textField = new JTextField("Watch the font style change", 25);
        add (textField);

        plainJRadioButton = new JRadioButton ("Plain", true);
        boldJRadioButton = new JRadioButton ("Bold", false);
        ItalicJRadioButton = new JRadioButton ("Italic", false);
        boldItalicJRadioButton =  new JRadioButton ("Bold/Italic", false);
        add (plainJRadioButton);
        add (boldJRadioButton);
        add (ItalicJRadioButton);
        add (boldItalicJRadioButton);

        radioGroup = new ButtonGroup();
        radioGroup.add (plainJRadioButton);
        radioGroup.add (boldJRadioButton);
        radioGroup.add (ItalicJRadioButton);
        radioGroup.add (boldItalicJRadioButton);

        plainFont = new Font ("Serif", Font.PLAIN, 14);
        boldFont = new Font ("Serif", Font.BOLD, 14);
        italicFont = new Font ("Serif", Font.ITALIC, 14);
        boldItalicFont = new Font ("Serif", Font.BOLD + Font.ITALIC, 14);
        textField.setFont (plainFont);

        plainJRadioButton.addItemListener(
         new RadioButtonHandler  (plainFont));
        boldJRadioButton.addItemListener(
         new RadioButtonHandler  (boldFont));
         ItalicJRadioButton.addItemListener
        ( new RadioButtonHandler  (italicFont));
         boldItalicJRadioButton.addItemListener(
         new RadioButtonHandler (boldItalicFont));
    }
    private class RadioButtonHandler implements ItemListener {
        private Font font;

        public RadioButtonHandler ( Font F){
        font =  F;
    }
    public void itemStateChanged (ItemEvent event){
        textField.setFont ( font );
    }
    }
}