JRadioButton to add Radio buttons to JFrame with events and grouping

Java Swing radio buttons allow users to select one option from a group of choices, where only one button in the group can be selected at a time.

The first line create one radio button

JRadioButton r1 = new JRadioButton("My Text here"); 
r1.setBounds(270, 183, 83, 38); // Position of radio button
f1.getContentPane().add(r1); // Radio button added to JFrame f1

Grouping radio buttons

There are two radio buttons r1 and r2.

ButtonGroup my_group = new ButtonGroup(); // New group created
my_group.add(r1);
my_group.add(r2);

You must import ButtonGroup, check that your IDE added this line at top. (error message Button cannot be resolved to a type )

import javax.swing.ButtonGroup;

Action Listener or Event with Radio Buttons

r1.addActionListener(new ActionListener() {  
	  public void actionPerformed(ActionEvent e) 
        {
           	// Action to be performed here
        }
});

ChangeListener

r1.addChangeListener(new ChangeListener() {
		public void stateChanged(ChangeEvent e) {
		}
	});

Reading the status

Our radio buttons can have only one of the two states, either Selected or Not Selected. We can get the status of the button by using isSelected(). It returns Boolean value , true if selected and false if not selected.

r1 is our JRadioButton.

r1.isSelected(); // true if selected, false otherwise

Reading and Updating Label of Radio button

We can read the text or Label associated with a radio button. Reading the text of JRadioButton r1.

String str=r1.getText();

Setting the text of r1.

r1.setText("I am selected");

Updating the status of radiobutton

We can change the staus of an JRadioButton to selected or not selected by using setSelected()

r1.setSelected(true); // r1 will be selected

For better understanding of the above concepts, you can develop applications using JRadioButton.
Applications to Understand the uses of JRadioButtons.

Button with Textfield and Lable

swing

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JRadioButton : Selecting one from the given options