Tutorial Addendum on Beat - Beat JRadioButton

This affiliate describes:

    

    
• JRadioButton chic and its accompanying classes.


    
• Different types contest accompanying radio button s.


    
• How to acquisition the called radio button .


    

JRadioButton and Accompanying Classes

    

javax.swing.JRadioButton - A Beat chic apery a UI radio button . Some

    

interesting methods are:

    

    
• JRadioButton(String) - Architect to make a radio button with the
  
      

  specified cord displayed next to the button .
  
      



    
• addActionListener(ActionListener) - Adjustment to add an activity adviser to this button
  
      

  to handle activity events. A abrasion bang on this button will activate one activity event.
  
      



    
• addChangeListener(ChangeListener) - Adjustment to add a change adviser to this button
  
      

  to handle change events. A abrasion bang on this button will activate some change events.
  
      



    
• addIteListener(ItemListener) - Adjustment to add an account adviser to this button
  
      

  to handle account events. A abrasion bang on this button will activate one account event.
  
      



    
• setActionCommand(String) - Adjustment to set an activity command cord to this button .
  
      



    

javax.swing.ButtonGroup - A Beat chic apery a accumulation of button s.

    

If one radio button is called in a group, all additional button s in the aforementioned group

    

are un-selected.

    

    
• add(AbstractButton) - Adjustment to add a button to this button group.
  
      



    
• getSelection() - Adjustment to acknowledgment the called button in this button accumulation as
  
      

  a ButtonModel object.
  
      



    

javax.swing.JToggleButton.ToggleButtonModel - A Beat chic apery a absence implementation

    

of toggle button s data model. ToggleButtonModel is an close chic nested inside

    

javax.swing.JToggleButton, which is a abject chic of JRadioButton.

    

    
• getActionCommand() - Adjustment to acknowledgment the activity command cord of the associated button .
  
      



    

JRadioButton and Accident Listeners

    

As you can see from the antecedent section, a radio button can accept 3 types of accident listensers:

    

ActionListener, ChangeListener, and ItemListener. The afterward sample program shows you

    

when those admirers are called, and how some times:

    

 

    
/**

    
 * JRadioButtonTest.java

    
 * Absorb (c) 2002 by Dr.  Yang

    
 */

    
import java.awt.*;

    
import java.awt.event.*;

    
import javax.swing.*;

    
import javax.swing.event.*;

    
public chic JRadioButtonTest {

    
   accessible changeless abandoned main(String[] a) {

    
      JFrame f = new JFrame("My Radio Buttons");

    
      f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    
      ButtonGroup g = new ButtonGroup();

    
      MyRadioButton b1 = new MyRadioButton("On");

    
      g.add(b1);

    
      f.getContentPane().add(b1,BorderLayout.NORTH);

    
      MyRadioButton b2 = new MyRadioButton("Off");

    
      g.add(b2);

    
      f.getContentPane().add(b2,BorderLayout.SOUTH);

    
      f.pack();

    
      f.setVisible(true);

    
   }

    
   clandestine changeless chic MyRadioButton extends JRadioButton 

    
      accouterments ActionListener, ChangeListener, ItemListener  {

    
      changeless int calculation = 0;

    
      Cord argument = null;

    
      accessible MyRadioButton(String t) {

    
         super(t);

    
         argument = t;

    
         addActionListener(this);

    
         addChangeListener(this);

    
         addItemListener(this);

    
      }

    
      accessible abandoned actionPerformed(ActionEvent e) {

    
         count++;

    
         System.out.println(count+": Activity performed - "+text);

    
      }

    
      accessible abandoned stateChanged(ChangeEvent e) {

    
         count++;

    
         System.out.println(count+": Accompaniment afflicted on - "+text);

    
      }

    
      accessible abandoned itemStateChanged(ItemEvent e) {

    
         count++;

    
         System.out.println(count+": Account accompaniment afflicted - "+text);

    
      }

    
   }

    
}