JRadioButton and Button Group Example Java

This is an exclusive program on JRadioButton and ButtonGroup.

To group six radio buttons, two objects of ButtonGroup are created and for each group three radio buttons are added. User’s selection is displayed using JOptionPane showMessageDialog() method. There is no counterpart class for this class in java.awt package; it is a new introduction in javax.swing package. The counterpart of ButtonGroup in AWT is CheckboxGroup.

Example on JRadioButton – ButtonGroup

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

public class JRadioDemo extends JFrame implements ItemListener
{
  JRadioButton shirtbut, pantbut, sareebut, brownbut, graybut, creambut ;

  public JRadioDemo()
  {
    Container c = getContentPane(); 	
    c.setLayout(new FlowLayout());
                // to create ButtonGroup objects that group checkboxes
    ButtonGroup group1 = new ButtonGroup();
    ButtonGroup group2 = new ButtonGroup();
                                          // first set of radio buttons for clothes selection
    shirtbut = new JRadioButton("Shirt");
    pantbut = new JRadioButton("Pant");
    sareebut = new JRadioButton("Saree");
                                          // second set of radio buttons for color selection
    brownbut = new JRadioButton("Brown");
    graybut = new JRadioButton("Gray");
    creambut = new JRadioButton("Cream");		
                                          // actually here, checkboxes are conveted into radio buttons
    group1.add(shirtbut);                 // shirtbut, pantbut and sareebut are made into
    group1.add(pantbut);                                                             
                                          // one group by using group1 object of ButtonGroup class
    group1.add(sareebut);                                                            

    group2.add(brownbut);                 // brownbut, graybut and creambut are make into
    group2.add(graybut);                                               // one group using group2 object
    group2.add(creambut);
                                          // add individual checkboxes to the container
    c.add(shirtbut); 
    c.add(pantbut);
    c.add(sareebut);
    c.add(brownbut);
    c.add(graybut);
    c.add(creambut);
                                          // register each checkbox with the listener
    shirtbut.addItemListener(this);
    pantbut.addItemListener(this);
    sareebut.addItemListener(this);
    brownbut.addItemListener(this);
    graybut.addItemListener(this);
    creambut.addItemListener(this);
    
    setTitle("Learning Radio Buttons");
    setSize(250,200);
    setVisible(true);
  }
  public void itemStateChanged(ItemEvent e)
  {
    String name = "", color = "";         // two local variables

    if(shirtbut.isSelected())
      name = "Shirt";
    else if(pantbut.isSelected())
      name = "Pant";
    else if(sareebut.isSelected())
      name = "Saree";

    if(brownbut.isSelected())
      color = "Brown";
    else if(graybut.isSelected())
      color = "Gray";
    else if(creambut.isSelected())
      color = "Cream";
   
    JOptionPane.showMessageDialog(null, "You wanted " + name + " in color " + color, "Learning Applications", JOptionPane.INFORMATION_MESSAGE);
  }
  public static void main( String args[ ] )
  {
    new JRadioDemo();
  }
}

String name = “”, color = “”;

Two temporary string variables, name and color are taken and values are assigned dynamically as per the user selection of radio buttons. These values are displayed in JOptionPane.

Two more programs exist on JCheckBox and JRadioButton:

1. JCheckBox and JRadioButton
2. JCheckBox Selection