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Radio buttons are identical to Checkboxes but grouped so that only one checkbox in a group can be on at a time. They use same class for buttons but add CheckboxGroup class
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CheckboxGroup cbg = new CheckboxGroup();
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cb1 = new Checkbox("Red", cbg, false));
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cb2 = new Checkbox("Green", cbg, false));
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cb3 = new Checkbox("Blue", cbg, true));
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add(cb1); add(cb2); add(cb3);
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In addition to checking the state of checkboxes in a group, the method getCurrent returns the one checkbox which is on:
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cb = cbg.getSelectedCheckbox();
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