BD Computer Technology - Java Programming: SWING

java.lang.Object
java.awt.Component
   java.awt.Container
       javax.swing.JComponent
           javax.swing.AbstractButton
               javax.swing.JToggleButton
                   javax.swing.JRadioButton

Constructor Summary
`JRadioButton()` Creates an initially unselected radio button with no set text.
`JRadioButton(Action a)` Creates a radiobutton where properties are taken from the Action supplied.
`JRadioButton(Icon icon)` Creates an initially unselected radio button with the specified image but no text.
`JRadioButton(Icon icon, boolean selected)` Creates a radio button with the specified image and selection state, but no text.
`JRadioButton(String text)` Creates an unselected radio button with the specified text.
`JRadioButton(String text, boolean selected)` Creates a radio button with the specified text and selection state.
`JRadioButton(String text, Icon icon)` Creates a radio button that has the specified text and image, and that is initially unselected.
`JRadioButton(String text, Icon icon, boolean selected)` Creates a radio button that has the specified text, image, and selection state.

Method Summary
`protected void`	`configurePropertiesFromAction(Action a)` Factory method which sets the `ActionEvent` source's properties according to values from the Action instance.
`protected PropertyChangeListener`	`createActionPropertyChangeListener(Action a)` Factory method which creates the PropertyChangeListener used to update the ActionEvent source as properties change on its Action instance.
`AccessibleContext`	`getAccessibleContext()` Gets the AccessibleContext associated with this JRadioButton.
`String`	`getUIClassID()` Returns the name of the L&F class that renders this component.
`protected String`	`paramString()` Returns a string representation of this JRadioButton.
`void`	`updateUI()` Resets the UI property to a value from the current look and feel.

Example

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

public class Radiobutton extends JApplet implements ItemListener{
JTextField text;
JRadioButton radio1, radio2, radio3, radio4;
ButtonGroup group;

public void init() {

Container frame1=getContentPane();
frame1.setLayout(new FlowLayout());

group=new ButtonGroup();

radio1=new JRadioButton("Radio Button 1");
radio2=new JRadioButton("Radio Button 2");
radio3=new JRadioButton("Radio Button 3");
radio4=new JRadioButton("Radio Button 4");
text=new JTextField(20);

group.add(radio1);
group.add(radio2);
group.add(radio3);
group.add(radio4);

radio1.addItemListener(this);
radio2.addItemListener(this);
radio3.addItemListener(this);
radio4.addItemListener(this);

frame1.add(radio1);
frame1.add(radio2);
frame1.add(radio3);
frame1.add(radio4);

frame1.add(text);
}

public void itemStateChanged(ItemEvent e){
if(e.getItemSelectable()==radio1){
text.setText("You Select Radio Button 1");
}else if(e.getItemSelectable()==radio2){
text.setText("You Select Radio Button 2");
}else if(e.getItemSelectable()==radio3){
text.setText("You Select Radio Button 3");
}else if(e.getItemSelectable()==radio4){
text.setText("You Select Radio Button 4");
}

}
}

Output

SWING - Radio Buttons