SWING - JRadioButton Class


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Introduction

The class JRadioButton is an implementation of a radio button - an item that can be selected or deselected, and which displays its state to the user.

Class Declaration

Following is the declaration for javax.swing.JRadioButton class −

public class JRadioButton
   extends JToggleButton
      implements Accessible

Class Constructors

Sr.No. Constructor & Description
1

JRadioButton()

Creates an initially unselected radio button with no set text.

2

JRadioButton(Action a)

Creates a radiobutton where properties are taken from the Action supplied.

3

JRadioButton(Icon icon)

Creates an initially unselected radio button with the specified image but no text

4

JRadioButton(Icon icon, boolean selected)

Creates a radio button with the specified image and selection state, but no text.

5

JRadioButton(String text, boolean selected)

Creates a radio button with the specified text and selection state.

6

JRadioButton(String text, Icon icon)

Creates a radio button that has the specified text and image, and which is initially unselected.

7

JRadioButton(String text, Icon icon, boolean selected)

Creates a radio button that has the specified text, image, and selection state.

Class Methods

Sr.No. Method & Description
1

AccessibleContext getAccessibleContext()

Gets the AccessibleContext associated with this JRadioButton.

2

String getUIClassID()

Returns the name of the L&F class that renders this component.

3

protected String paramString()

Returns a string representation of this JRadioButton.

4

void updateUI()

Resets the UI property to a value from the current look and feel.

Methods Inherited

This class inherits methods from the following classes −

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

JRadioButton Example

Create the following Java program using any editor of your choice in say D:/ > SWING > com > tutorialspoint > gui >

SwingControlDemo.java

package com.tutorialspoint.gui;
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class SwingControlDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;
   
   public SwingControlDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
      SwingControlDemo  swingControlDemo = new SwingControlDemo();      
      swingControlDemo.showRadioButtonDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java Swing Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));
      
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      headerLabel = new JLabel("", JLabel.CENTER);        
      statusLabel = new JLabel("",JLabel.CENTER);    
      statusLabel.setSize(350,100);

      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private void showRadioButtonDemo(){
      headerLabel.setText("Control in action: RadioButton"); 

      final JRadioButton radApple = new JRadioButton("Apple", true);
      final JRadioButton radMango = new JRadioButton("Mango");
      final JRadioButton radPeer = new JRadioButton("Peer");

      radApple.setMnemonic(KeyEvent.VK_C);
      radMango.setMnemonic(KeyEvent.VK_M);
      radPeer.setMnemonic(KeyEvent.VK_P);

      radApple.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {         
            statusLabel.setText("Apple RadioButton: " 
               + (e.getStateChange()==1?"checked":"unchecked"));
         }           
      });
      radMango.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {             
            statusLabel.setText("Mango RadioButton: " 
               + (e.getStateChange()==1?"checked":"unchecked")); 
         }           
      });
      radPeer.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {             
            statusLabel.setText("Peer RadioButton: " 
               + (e.getStateChange()==1?"checked":"unchecked"));
         }           
      });
      
      //Group the radio buttons.
      ButtonGroup group = new ButtonGroup();
      
      group.add(radApple);
      group.add(radMango);
      group.add(radPeer);

      controlPanel.add(radApple);
      controlPanel.add(radMango);
      controlPanel.add(radPeer);       

      mainFrame.setVisible(true);  
   }
}

Compile the program using the command prompt. Go to D:/ > SWING and type the following command.

D:\SWING>javac com\tutorialspoint\gui\SwingControlDemo.java

If no error occurs, it means the compilation is successful. Run the program using the following command.

D:\SWING>java com.tutorialspoint.gui.SwingControlDemo

Verify the following output.

Swing JRadioButton
swing_controls.htm

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