Radio Buttons

• For a small set of mutually exclusive choices, use radio buttons or a combo box
• In a radio button set, only one button can be selected at a time
• When a button is selected, previously selected button in set is automatically turned off
• In previous figure, font sizes are mutually exclusive:

  JRadioButton smallButton = new JRadioButton("Small");
  JRadioButton mediumButton = new JRadioButton("Medium");
  JRadioButton largeButton = new JRadioButton("Large");
  
  // Add radio buttons into a ButtonGroup so that 
  // only one button in group is on at any time
  ButtonGroup group = new ButtonGroup();
  group.add(smallButton);
  group.add(mediumButton);
  group.add(largeButton);