GWT - RadioButton Widget



The RadioButton widget represents a mutually exclusive selection radio button.

Class Declaration

Following is the declaration for class −

public class RadioButton
   extends CheckBox

CSS Style Rules

Following default CSS Style rules will be applied to all the RadioButton widget. You can override it as per your requirements.

.gwt-RadioButton {} 

Class Constructors

Sr.No. Constructor & Description

RadioButton(java.lang.String name)

Creates a new radio associated with a particular group name.


RadioButton(java.lang.String name,java.lang.String label)

Creates a new radio associated with a particular group, and initialized with the given HTML label.


RadioButton(java.lang.String name,java.lang.String label, boolean asHTML)

Creates a new radio button associated with a particular group, and initialized with the given label (optionally treated as HTML).

Class Methods

Sr.No. Function name & Description

void setName(java.lang.String name)

Change the group name of this radio button.

Methods Inherited

This class inherits methods from the following classes −





  • java.lang.Object

RadioButton Widget Example

This example will take you through simple steps to show usage of a RadioButton Widget in GWT. Follow the following steps to update the GWT application we created in GWT - Create Application chapter −

Step Description
1 Create a project with a name HelloWorld under a package com.tutorialspoint as explained in the GWT - Create Application chapter.
2 Modify HelloWorld.gwt.xml, HelloWorld.css, HelloWorld.html and as explained below. Keep rest of the files unchanged.
3 Compile and run the application to verify the result of the implemented logic.

Following is the content of the modified module descriptor src/com.tutorialspoint/HelloWorld.gwt.xml.

<?xml version = "1.0" encoding = "UTF-8"?>
<module rename-to = 'helloworld'>
   <!-- Inherit the core Web Toolkit stuff.                        -->
   <inherits name = ''/>

   <!-- Inherit the default GWT style sheet.                       -->
   <inherits name = ''/>

   <!-- Specify the app entry point class.                         -->
   <entry-point class = 'com.tutorialspoint.client.HelloWorld'/>

   <!-- Specify the paths for translatable code                    -->
   <source path = 'client'/>
   <source path = 'shared'/>


Following is the content of the modified Style Sheet file war/HelloWorld.css.

body {
   text-align: center;
   font-family: verdana, sans-serif;

h1 {
   font-size: 2em;
   font-weight: bold;
   color: #777777;
   margin: 40px 0px 70px;
   text-align: center;

.gwt-RadioButton { 

Following is the content of the modified HTML host file war/HelloWorld.html.

      <title>Hello World</title>
      <link rel = "stylesheet" href = "HelloWorld.css"/>
      <script language = "javascript" src = "helloworld/helloworld.nocache.js">

      <h1>RadioButton Widget Demonstration</h1>
      <div id = "gwtContainer"></div>

Let us have following content of Java file src/com.tutorialspoint/ which will demonstrate use of RadioButton widget.

package com.tutorialspoint.client;


public class HelloWorld implements EntryPoint {
   public void onModuleLoad() {

       // Create some radio buttons, all in one group 'radioGroup'.
       RadioButton radioButton1 = new RadioButton("radioGroup", "First");
       RadioButton radioButton2 = new RadioButton("radioGroup", "Second");
       RadioButton radioButton3 = new RadioButton("radioGroup", "Third");

       // Check 'First' by default.

      //disable 'Second' radio button

      // Add toggle button to the root panel.
      VerticalPanel panel = new VerticalPanel();


Once you are ready with all the changes done, let us compile and run the application in development mode as we did in GWT - Create Application chapter. If everything is fine with your application, this will produce following result −

GWT RadioButton Widget