Java javax.swing Class JButton（JDK8）

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

  @ConstructorProperties(value="text")
  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 AbstractButton

  See Also:

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

• 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 Component

  Returns:

  an AccessibleJButton that serves as the AccessibleContext of this JButton