Radio Button :
(i) isSelected() returns true if the component is checked else returns false.
boolean b = < radiobutton-name > .isSelected();
(ii) setSelected() checks(true) or unchecks the radio button.
<radiobutton-name>.setSelected(boolean b);
Checkbox :
(i) isselected() returns true if the component is checked else returns false.
boolean b = <checkbox-name>.isSelected();
(ii) setSelected() checks(true) or unchecks the checkbox.
< checkbox-name >.setSelected (boolean b);