JRadioButtonpublic class JRadioButton extends JToggleButton implements AccessibleAn implementation of a radio button -- an item that can be selected or
deselected, and which displays its state to the user.
Used with a {@link ButtonGroup} object to create a group of buttons
in which only one button at a time can be selected. (Create a ButtonGroup
object and use its add method to include the JRadioButton objects
in the group.)
Note:
The ButtonGroup object is a logical grouping -- not a physical grouping.
Tocreate a button panel, you should still create a {@link JPanel} or similar
container-object and add a {@link javax.swing.border.Border} to it to set it off from surrounding
components.
See How to Use Buttons, Check Boxes, and Radio Buttons
in The Java Tutorial
for further documentation.
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 {@link java.beans.XMLEncoder}. |
| Fields Summary |
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| private static final String | uiClassID |
| Constructors Summary |
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public JRadioButton()Creates an initially unselected radio button
with no set text.
this(null, null, false);
| public JRadioButton(Icon icon)Creates an initially unselected radio button
with the specified image but no text.
this(null, icon, false);
| public JRadioButton(Action a)Creates a radiobutton where properties are taken from the
Action supplied.
this();
setAction(a);
| public JRadioButton(Icon icon, boolean selected)Creates a radio button with the specified image
and selection state, but no text.
this(null, icon, selected);
| public JRadioButton(String text)Creates an unselected radio button with the specified text.
this(text, null, false);
| public JRadioButton(String text, boolean selected)Creates a radio button with the specified text
and selection state.
this(text, null, selected);
| public JRadioButton(String text, Icon icon)Creates a radio button that has the specified text and image,
and that is initially unselected.
this(text, icon, false);
| public JRadioButton(String text, Icon icon, boolean selected)Creates a radio button that has the specified text, image,
and selection state.
super(text, icon, selected);
setBorderPainted(false);
setHorizontalAlignment(LEADING);
|
| Methods Summary |
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| protected void | configurePropertiesFromAction(javax.swing.Action a)Factory method which sets the ActionEvent source's
properties according to values from the Action instance. The
properties which are set may differ for subclasses.
By default, the properties which get set are Text, Mnemonic,
Enabled, ActionCommand, and ToolTipText.
String[] types = { Action.MNEMONIC_KEY, Action.NAME,
Action.SHORT_DESCRIPTION,
Action.ACTION_COMMAND_KEY, "enabled" };
configurePropertiesFromAction(a, types);
| | protected java.beans.PropertyChangeListener | createActionPropertyChangeListener(javax.swing.Action a)Factory method which creates the PropertyChangeListener
used to update the ActionEvent source as properties change on
its Action instance. Subclasses may override this in order
to provide their own PropertyChangeListener if the set of
properties which should be kept up to date differs from the
default properties (Text, Icon, Enabled, ToolTipText).
Note that PropertyChangeListeners should avoid holding
strong references to the ActionEvent source, as this may hinder
garbage collection of the ActionEvent source and all components
in its containment hierarchy.
return new AbstractActionPropertyChangeListener(this, a) {
public void propertyChange(PropertyChangeEvent e) {
String propertyName = e.getPropertyName();
AbstractButton button = (AbstractButton)getTarget();
if (button == null) { //WeakRef GC'ed in 1.2
Action action = (Action)e.getSource();
action.removePropertyChangeListener(this);
} else {
if (propertyName.equals(Action.NAME)) {
String text = (String) e.getNewValue();
button.setText(text);
button.repaint();
} else if (propertyName.equals(Action.SHORT_DESCRIPTION)) {
String text = (String) e.getNewValue();
button.setToolTipText(text);
} else if (propertyName.equals("enabled")) {
Boolean enabledState = (Boolean) e.getNewValue();
button.setEnabled(enabledState.booleanValue());
button.repaint();
} else if (propertyName.equals(Action.ACTION_COMMAND_KEY)) {
button.setActionCommand((String)e.getNewValue());
}
}
}
};
| | public javax.accessibility.AccessibleContext | getAccessibleContext()Gets the AccessibleContext associated with this JRadioButton.
For JRadioButtons, the AccessibleContext takes the form of an
AccessibleJRadioButton.
A new AccessibleJRadioButton instance is created if necessary.
if (accessibleContext == null) {
accessibleContext = new AccessibleJRadioButton();
}
return accessibleContext;
| | public java.lang.String | getUIClassID()Returns the name of the L&F class
that renders this component.
return uiClassID;
| | protected java.lang.String | paramString()Returns a string representation of this JRadioButton. This method
is intended to be used only for debugging purposes, and the
content and format of the returned string may vary between
implementations. The returned string may be empty but may not
be null.
return super.paramString();
| | public void | updateUI()Resets the UI property to a value from the current look and feel.
setUI((ButtonUI)UIManager.getUI(this));
| | private void | writeObject(java.io.ObjectOutputStream s)See readObject() and writeObject() in JComponent for more
information about serialization in Swing.
s.defaultWriteObject();
if (getUIClassID().equals(uiClassID)) {
byte count = JComponent.getWriteObjCounter(this);
JComponent.setWriteObjCounter(this, --count);
if (count == 0 && ui != null) {
ui.installUI(this);
}
}
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