Question

How to get the selected JRadioButton from a ButtonGroup?

Answer 1

To get the selected JRadioButton from a ButtonGroup in Java, you can use the getSelection() method of the ButtonGroup class. 

Here's an example:

ButtonGroup buttonGroup = new ButtonGroup();

JRadioButton radioButton1 = new JRadioButton("Option 1");
JRadioButton radioButton2 = new JRadioButton("Option 2");

buttonGroup.add(radioButton1);
buttonGroup.add(radioButton2);

// ... Add the radio buttons to a container ...

// Get the selected radio button
JRadioButton selectedRadioButton = (JRadioButton) buttonGroup.getSelection();

if (selectedRadioButton != null) {
    // A radio button is selected
    System.out.println("Selected option: " + selectedRadioButton.getText());
} else {
    // No radio button is selected
    System.out.println("No option selected");
}
 

In this example, a ButtonGroup is created and two JRadioButtons are added to it. The getSelection() method is called to get the selected radio button, which is returned as a ButtonModel. The ButtonModel is cast to a JRadioButton using (JRadioButton), and its getText() method is called to get the label of the selected button.

If no radio button is selected, getSelection() returns null.