JButton (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 JButton

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

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

Direct Known Subclasses:: BasicArrowButton, MetalComboBoxButton

public class JButton
extends AbstractButton
implements Accessible

An implementation of a "push" button. See How to Use Buttons, Check Boxes, and Radio Buttons in The Java Tutorial for information and examples of using buttons.

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

Constructor Detail

JButton

public JButton()

Creates a button with no set text or icon.

JButton

public JButton(Icon icon)

Creates a button with an icon.
Parameters:: icon - the Icon image to display on the button

JButton

public JButton(String text)

Creates a button with text.
Parameters:: text - the text of the button

JButton

public JButton(Action a)

Creates a button where properties are taken from the Action supplied.
Parameters:: a - the Action used to specify the new button
Since:: 1.3

JButton

public JButton(String text,
               Icon icon)

Creates a button with initial text and an icon.
Parameters:: text - the text of the button; icon - the Icon image to display on the button

Method Detail

updateUI

public void updateUI()

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

Overrides:: updateUI in class AbstractButton

See Also:: JComponent.updateUI()

getUIClassID

public String getUIClassID()

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

Overrides:: getUIClassID in class JComponent

Returns:: the string "ButtonUI"
See Also:: JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

isDefaultButton

public boolean isDefaultButton()

Gets the value of the defaultButton property, which if true means that this button is the current default button for its JRootPane. Most look and feels render the default button differently, and may potentially provide bindings to access the default button.

Returns:: the value of the defaultButton property
See Also:: JRootPane.setDefaultButton(javax.swing.JButton), isDefaultCapable()

isDefaultCapable

public boolean isDefaultCapable()

Gets the value of the defaultCapable property.

Returns:: the value of the defaultCapable property
See Also:: setDefaultCapable(boolean), isDefaultButton(), JRootPane.setDefaultButton(javax.swing.JButton)

setDefaultCapable

public void setDefaultCapable(boolean defaultCapable)

Sets the defaultCapable property, which determines whether this button can be made the default button for its root pane. The default value of the defaultCapable property is true unless otherwise specified by the look and feel.

Parameters:: defaultCapable - true if this button will be capable of being the default button on the RootPane; otherwise false
See Also:: isDefaultCapable()

removeNotify

public void removeNotify()

Overrides JComponent.removeNotify to check if this button is currently set as the default button on the RootPane, and if so, sets the RootPane's default button to null to ensure the RootPane doesn't hold onto an invalid button reference.

Overrides:: removeNotify in class JComponent

See Also:: JComponent.registerKeyboardAction(java.awt.event.ActionListener, java.lang.String, javax.swing.KeyStroke, int)

configurePropertiesFromAction

protected void configurePropertiesFromAction(Action a)

Factory method which sets the AbstractButton's properties according to values from the Action instance. The properties which get set may differ for AbstractButton subclasses. By default, the properties which get set are Text, Icon, Enabled, ToolTipText, ActionCommand, and Mnemonic.

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)

paramString

protected String paramString()

Returns a string representation of this JButton. 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 AbstractButton

Returns:: a string representation of this JButton

getAccessibleContext

public AccessibleContext getAccessibleContext()

Gets the AccessibleContext associated with this JButton. For JButtons, the AccessibleContext takes the form of an AccessibleJButton. A new AccessibleJButton instance is created if necessary.

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

Returns:: an AccessibleJButton that serves as the AccessibleContext of this JButton

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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`	`JButton.AccessibleJButton` This class implements accessibility support for the `JButton` class.

Constructor Summary
`JButton()` Creates a button with no set text or icon.
`JButton(Action a)` Creates a button where properties are taken from the `Action` supplied.
`JButton(Icon icon)` Creates a button with an icon.
`JButton(String text)` Creates a button with text.
`JButton(String text, Icon icon)` Creates a button with initial text and an icon.

Method Summary
`protected void`	`configurePropertiesFromAction(Action a)` Factory method which sets the `AbstractButton`'s properties according to values from the `Action` instance.
`AccessibleContext`	`getAccessibleContext()` Gets the `AccessibleContext` associated with this `JButton`.
`String`	`getUIClassID()` Returns a string that specifies the name of the L&F class that renders this component.
`boolean`	`isDefaultButton()` Gets the value of the `defaultButton` property, which if `true` means that this button is the current default button for its `JRootPane`.
`boolean`	`isDefaultCapable()` Gets the value of the `defaultCapable` property.
`protected String`	`paramString()` Returns a string representation of this `JButton`.
`void`	`removeNotify()` Overrides `JComponent.removeNotify` to check if this button is currently set as the default button on the `RootPane`, and if so, sets the `RootPane`'s default button to `null` to ensure the `RootPane` doesn't hold onto an invalid button reference.
`void`	`setDefaultCapable(boolean defaultCapable)` Sets the `defaultCapable` property, which determines whether this button can be made the default button for its root pane.
`void`	`updateUI()` Resets the UI property to a value from the current look and feel.

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

javax.swing Class JButton

JButton

JButton

JButton

JButton

JButton

updateUI

getUIClassID

isDefaultButton

isDefaultCapable

setDefaultCapable

removeNotify

configurePropertiesFromAction

paramString

getAccessibleContext

javax.swing
Class JButton