RadioButton

.......................................Ονομάζουμε την κλάση Gui.java..............................................

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Gui extends JFrame
{
private JTextField tf;
private Font pf;
private Font bf;
private Font itf;
private Font bif;
private JRadioButton pb;
private JRadioButton bb;
private JRadioButton ib;
private JRadioButton bib;
private ButtonGroup group;

public Gui ()
{
super("Kalpos Radio Button");
setLayout(new FlowLayout());

tf = new JTextField("Kalpos is the best programmer in the universe",25);
add(tf);

pb = new JRadioButton("plain",true);
bb = new JRadioButton("bold",false);
ib = new JRadioButton("italic",false);
bib = new JRadioButton("bold and italic",false);
add(pb);
add(bb);
add(bib);

group = new ButtonGroup();
group.add(pb);
group.add(bb);
group.add(ib);
group.add(bib);

pf = new Font("Serif", Font.PLAIN,14);
bf = new Font("Serif", Font.BOLD,14);
itf = new Font("Serif", Font.ITALIC,14);
bif = new Font("Serif", Font.BOLD + Font.ITALIC,14);
tf.setFont(pf);

//wait for event to happen, pass in font object to constructor
pb.addItemListener(new HandlerClass(pf));
bb.addItemListener(new HandlerClass(bf));
ib.addItemListener(new HandlerClass(itf));
bib.addItemListener(new HandlerClass(bif));
}


private class HandlerClass implements ItemListener
{
private Font font;

//the font object get variable font
public HandlerClass(Font f)
{
font = f;
}


//sets the font to the font object that was passed in
public void itemStateChanged(ItemEvent event)
{
tf.setFont(font);
}
}
}




.................... Άλλη κλάση με όνομα RadioButton.java .......................



import javax.swing.JFrame;

class RadioButton
{
public static void main(String[] args)
{

Gui go = new Gui();
go.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
go.setSize(300,200);
go.setVisible(true);


}
}