Home Java Example Java Swing Selecting a Radio Button component in Java

Selecting a Radio Button component in Java
Posted on: April 14, 2007 at 12:00 AM

In this section, you will learn how to set the radio buttons in a group so that only one can be selected at a time.

Selecting a Radio Button component in Java

In this section, you will learn how to set the radio buttons in a group so that only one can be selected at a time.

This program shows five radio buttons with labeled by "First", "Second", "Third", "Fourth" and "Fifth". This program also show a label which contains the text "Roseindia.net" but when you click on any radio button from a ButtonGroup the text of the selected radio button is shown on the label and a message box will be shown with message holds the selected radio button label. This is done through the generating event for the different-different radio buttons. Following are the screen shots for the result of the given program:

Radio Buttons without selection

Frame with a message dialog box when you select the second radio button

For this purposes, there are some APIs or methods have been used as follows:

getActionCommand():
This is the method of the ActionEvent class which returns the source title in string of the generated event.

Here is the code of the program:


import javax.swing.*;

import java.awt.*;

import java.awt.event.*;



public class SelectRadioButton{

  JLabel label;

  public static void main(String[] args){

  SelectRadioButton sr = new SelectRadioButton();

  }



  public SelectRadioButton(){

  JFrame frame = new JFrame("Radio button selection");

  JRadioButton first = new JRadioButton("First");

  JRadioButton second = new JRadioButton("Second");

  JRadioButton third = new JRadioButton("Third");

  JRadioButton fourth = new JRadioButton("Fourth");

  JRadioButton fifth = new JRadioButton("Fifth");

  JPanel panel = new JPanel();

  panel.add(first);

  panel.add(second);

  panel.add(third);

  panel.add(fourth);

  panel.add(fifth);

  ButtonGroup bg = new ButtonGroup();

  bg.add(first);

  bg.add(second);

  bg.add(third);

  bg.add(fourth);

  bg.add(fifth);

  first.addActionListener(new MyAction());

  second.addActionListener(new MyAction());

  third.addActionListener(new MyAction());

  fourth.addActionListener(new MyAction());

  fifth.addActionListener(new MyAction());

  label = new JLabel("Roseindia.net");

  frame.add(panel, BorderLayout.NORTH);

  frame.add(label, BorderLayout.CENTER);

  frame.setSize(400, 400);

  frame.setVisible(true);

  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  }



  public class MyAction implements ActionListener{

  public void actionPerformed(ActionEvent e){

  label.setText(e.getActionCommand());

  JOptionPane.showMessageDialog(null,"This is the " + e.getActionCommand() + 

" radio button.");

  }

  }

}

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