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

S.N. 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 that 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

S.N. 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 command prompt. Go to D:/ > SWING and type the following command.

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

If no error comes that means compilation is successful. Run the program using following command.

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

Verify the following output

Swing JRadioButton
swing_controls.htm

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