Radio buttons:

A special type of button is the radio button. Radio buttons are grouped together and have the property that only one of the buttons can be selected at a time. Clicking on a radio button means that the radio button that was selected previously becomes unselected.

Radio buttons are created using the class JRadioButton and are grouped together in a ButtonGroup. The code that illustrates this is shown below:

// first create the button group
ButtonGroup language = new ButtonGroup( );
...
// then create the buttons
JRadioButton frenchButton = new JRadioButton("French", true);
JRadioButton germanButton = new JRadioButton("German", false);
JRadioButton englishButton = new JRadioButton("English", false);
...
// then add the buttons to the button group language.add(frenchButton); language.add(germanButton); language.add(englishButton);
...

In the code, a ButtonGroup object is first created and then three JRadioButtons are created using the two-argument constructor for that class. The first argument is the label for the radio button and the second argument is a boolean that indicates how the radio button is initially set. In this case, the "French" button will be selected initially.

The ButtonGroup links the radio buttons together logically so that only one can be selected at any time, but it does not display the radio buttons visually. In order to see the radio buttons you will have to add them to a JPanel and then cause the JPanel to be displayed. This also aids in placing the whole group of radio buttons on the screen as a coherent group.

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