One.
Car radios and some table radios have buttons
for selecting radio stations.
Only one station is selected at a time.
When one button is pushed in the
previous one pops out.
The Swing class
JRadioButton
works the same way.
Radio buttons must be members of a
ButtonGroup
.
Only one button of a button group is
selected at any time.
JRadioButton
:
(There are other constructors that may be useful,
but not mentioned here.)
(See the Java documentation.)
JRadioButton( String text, boolean selected )
text
is the string that is placed next to the button.
If selected
is true then this button
starts out selected.
Only one button of a button group may start out as selected.
JRadioButton
is a child class of
JAbstractButton
.
Radio buttons and JButtons
have many methods
in common.
(Thought Question: ) Does clicking on a radio button generate an action event?