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;

public class RadioButtonFrame extends JFrame {
    private JTextField textField;
    private Font plainFont;
    private Font boldFont;
    private Font italicFont;
    private Font boldItalicFont;
    private JRadioButton plainJRadioButton;
    private JRadioButton boldJRadioButton;
    private JRadioButton italicJRadioButton;
    private JRadioButton boldItalicJRadioButton;
    private ButtonGroup radioGroup;

    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);
        }
    }
 }