now that you've seen the capabilities of the relatively simple Swing components JLabel and JButton, it's time to take a look at more-active components, specifically those that can be toggled. These so-called toggleable components—JToggleButton, JCheckBox, and JRadioButton — provide the means for your users to select from among a set of options. These options are either on or off, or enabled or disabled. When presented in a ButtonGroup, only one of the options in the group can be selected at a time. To deal with this selection state, the components share a common data model with ToggleButtonModel. Let's take a look at the data model, the components' grouping mechanism with ButtonGroup, and the individual components.