public class ButtonGroup extends Object implements Serializable
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 JavaBeans™
 has been added to the java.beans package.
 Please see XMLEncoder.
| Modifier and Type | Field and Description | 
|---|---|
| protected Vector<AbstractButton> | buttons | 
| Constructor and Description | 
|---|
| ButtonGroup()Creates a new  ButtonGroup. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | add(AbstractButton b)Adds the button to the group. | 
| void | clearSelection()Clears the selection such that none of the buttons
 in the  ButtonGroupare selected. | 
| int | getButtonCount()Returns the number of buttons in the group. | 
| Enumeration<AbstractButton> | getElements()Returns all the buttons that are participating in
 this group. | 
| ButtonModel | getSelection()Returns the model of the selected button. | 
| boolean | isSelected(ButtonModel m)Returns whether a  ButtonModelis selected. | 
| void | remove(AbstractButton b)Removes the button from the group. | 
| void | setSelected(ButtonModel m,
           boolean b)Sets the selected value for the  ButtonModel. | 
protected Vector<AbstractButton> buttons
public void add(AbstractButton b)
b - the button to be addedpublic void remove(AbstractButton b)
b - the button to be removedpublic void clearSelection()
ButtonGroup are selected.public Enumeration<AbstractButton> getElements()
Enumeration of the buttons in this grouppublic ButtonModel getSelection()
public void setSelected(ButtonModel m, boolean b)
ButtonModel.
 Only one button in the group may be selected at a time.m - the ButtonModelb - true if this button is to be
   selected, otherwise falsepublic boolean isSelected(ButtonModel m)
ButtonModel is selected.true if the button is selected,
   otherwise returns falsepublic int getButtonCount()
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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