How to use the button group swing control in Java?

How do I add radio buttons to a button group using NetBeans?

Once they are added, how do I select radio buttons from the button group?

Solution

I strongly recommend reading this excellent tutorial This is a code excerpt from an article that meets your question of how to create and add buttons to buttongroup:

JRadioButton birdButton = new JRadioButton(birdString);
birdButton.setSelected(true);

JRadioButton catButton = new JRadioButton(catString);

   //Group the radio buttons.
ButtonGroup group = new ButtonGroup();
group.add(birdButton);
group.add(catButton);

As for which item to select, you basically need to iterate through the items in the group calling isselected