This class is used to create a multiple-exclusion scope for
a set of buttons. Creating a set of buttons with the
same
ButtonGroup
object means that
turning "on" one of those buttons
turns off all other buttons in the group.
A ButtonGroup
can be used with
any set of objects that inherit from AbstractButton
.
Typically a button group contains instances of
JRadioButton
,
JRadioButtonMenuItem
,
or JToggleButton
.
It wouldn't make sense to put an instance of
JButton
or JMenuItem
in a button group
because JButton
and JMenuItem
don't implement the selected state.
Initially, all buttons in the group are unselected.
For examples and further information on using button groups see
How to Use Radio Buttons,
a section in The Java Tutorial.
Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing. As of 1.4, support for long term storage
of all JavaBeansTM
has been added to the java.beans
package.
Please see XMLEncoder
.