Each circle is one Checkbox.

The Swing equivalent is called a JCheckBox, a JRadioButton or a JToggleButton. Checkbox uses getState and setState, where JCheckBox uses isSelected and setSelected. JCheckBox uses a checkmark; JRadioButton uses a dot in a circle, and JToggleButton uses ordinary-looking buttons.

Here is how to use a Checkbox:

Here is how you use a CheckboxGroup with Checkboxes:

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