JRadioButton (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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Java^TM 2 Platform
Std. Ed. v1.4.1

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javax.swing
Class JRadioButton

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.JComponent
                    |
                    +--javax.swing.AbstractButton
                          |
                          +--javax.swing.JToggleButton
                                |
                                +--javax.swing.JRadioButton

All Implemented Interfaces:: Accessible, ImageObserver, ItemSelectable, MenuContainer, Serializable, SwingConstants

public class JRadioButton
extends JToggleButton
implements Accessible

An implementation of a radio button -- an item that can be selected or deselected, and which displays its state to the user. Used with a 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 JPanel or similar container-object and add a 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.

For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JRadioButton key assignments.

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^TM has been added to the java.beans package. Please see XMLEncoder.

See Also:: ButtonGroup, JCheckBox

Constructor Detail

JRadioButton

public JRadioButton()

Creates an initially unselected radio button with no set text.

JRadioButton

public JRadioButton(Icon icon)

Creates an initially unselected radio button with the specified image but no text.
Parameters:: icon - the image that the button should display

JRadioButton

public JRadioButton(Action a)

Creates a radiobutton where properties are taken from the Action supplied.
Since:: 1.3

JRadioButton

public JRadioButton(Icon icon,
                    boolean selected)

Creates a radio button with the specified image and selection state, but no text.
Parameters:: icon - the image that the button should display; selected - if true, the button is initially selected; otherwise, the button is initially unselected

JRadioButton

public JRadioButton(String text)

Creates an unselected radio button with the specified text.
Parameters:: text - the string displayed on the radio button

JRadioButton

public JRadioButton(String text,
                    boolean selected)

Creates a radio button with the specified text and selection state.
Parameters:: text - the string displayed on the radio button; selected - if true, the button is initially selected; otherwise, the button is initially unselected

JRadioButton

public JRadioButton(String text,
                    Icon icon)

Creates a radio button that has the specified text and image, and that is initially unselected.
Parameters:: text - the string displayed on the radio button; icon - the image that the button should display

JRadioButton

public JRadioButton(String text,
                    Icon icon,
                    boolean selected)

Creates a radio button that has the specified text, image, and selection state.
Parameters:: text - the string displayed on the radio button; icon - the image that the button should display

Method Detail

updateUI

public void updateUI()

Resets the UI property to a value from the current look and feel.

Overrides:: updateUI in class JToggleButton

See Also:: JComponent.updateUI()

getUIClassID

public String getUIClassID()

Returns the name of the L&F class that renders this component.

Overrides:: getUIClassID in class JToggleButton

Returns:: String "RadioButtonUI"
See Also:: JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

configurePropertiesFromAction

protected void configurePropertiesFromAction(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.

Overrides:: configurePropertiesFromAction in class AbstractButton

Parameters:: a - the Action from which to get the properties, or null
Since:: 1.3
See Also:: Action, AbstractButton.setAction(javax.swing.Action)

createActionPropertyChangeListener

protected PropertyChangeListener createActionPropertyChangeListener(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.

Overrides:: createActionPropertyChangeListener in class AbstractButton

Parameters:: a - the new action for the button
Since:: 1.3
See Also:: Action, AbstractButton.setAction(javax.swing.Action)

paramString

protected 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.

Overrides:: paramString in class JToggleButton

Returns:: a string representation of this JRadioButton.

getAccessibleContext

public 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.

Specified by:: getAccessibleContext in interface Accessible
Overrides:: getAccessibleContext in class JToggleButton

Returns:: an AccessibleJRadioButton that serves as the AccessibleContext of this JRadioButton

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Java^TM 2 Platform
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Nested Class Summary
`protected class`	`JRadioButton.AccessibleJRadioButton` This class implements accessibility support for the `JRadioButton` class.

Constructor Summary
`JRadioButton()` Creates an initially unselected radio button with no set text.
`JRadioButton(Action a)` Creates a radiobutton where properties are taken from the Action supplied.
`JRadioButton(Icon icon)` Creates an initially unselected radio button with the specified image but no text.
`JRadioButton(Icon icon, boolean selected)` Creates a radio button with the specified image and selection state, but no text.
`JRadioButton(String text)` Creates an unselected radio button with the specified text.
`JRadioButton(String text, boolean selected)` Creates a radio button with the specified text and selection state.
`JRadioButton(String text, Icon icon)` Creates a radio button that has the specified text and image, and that is initially unselected.
`JRadioButton(String text, Icon icon, boolean selected)` Creates a radio button that has the specified text, image, and selection state.

Method Summary
`protected void`	`configurePropertiesFromAction(Action a)` Factory method which sets the `ActionEvent` source's properties according to values from the Action instance.
`protected PropertyChangeListener`	`createActionPropertyChangeListener(Action a)` Factory method which creates the PropertyChangeListener used to update the ActionEvent source as properties change on its Action instance.
`AccessibleContext`	`getAccessibleContext()` Gets the AccessibleContext associated with this JRadioButton.
`String`	`getUIClassID()` Returns the name of the L&F class that renders this component.
`protected String`	`paramString()` Returns a string representation of this JRadioButton.
`void`	`updateUI()` Resets the UI property to a value from the current look and feel.

JRadioButton (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

javax.swing Class JRadioButton

JRadioButton

JRadioButton

JRadioButton

JRadioButton

JRadioButton

JRadioButton

JRadioButton

JRadioButton

updateUI

getUIClassID

configurePropertiesFromAction

createActionPropertyChangeListener

paramString

getAccessibleContext

javax.swing
Class JRadioButton