Radio Buttons

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.

Here is a constructor for JRadioButton: (There are other constructors not discussed 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.