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("Veja a fonte mudar", 25);
		add (textField);

		plainJRadioButton = new JRadioButton("Normal", true);
		boldJRadioButton = new JRadioButton("Negrito", false);
		italicJRadioButton = new JRadioButton("Itálico", false);
		boldItalicJRadioButton = new JRadioButton("Negrito e Itálico", 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);

		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);
		}
	}
}