File	Doc	Category	Size	Date	Package
JButton.java	API Doc	Java SE 5 API	9878	Fri Aug 26 14:57:54 BST 2005	javax.swing

JButton

• java.lang.Object
  • java.awt.Component
    • java.awt.Container
      • javax.swing.JComponent
        • javax.swing.AbstractButton

Fields Summary
private static final String	uiClassID

Constructors Summary
public JButton() Creates a button with no set text or icon. this(null, null);
public JButton(Icon icon) Creates a button with an icon. param icon the Icon image to display on the button this(null, icon);
public JButton(String text) Creates a button with text. param text the text of the button this(text, null);
public JButton(Action a) Creates a button where properties are taken from the Action supplied. param a the Action used to specify the new button since 1.3 this(); setAction(a);
public JButton(String text, Icon icon) Creates a button with initial text and an icon. param text the text of the button param icon the Icon image to display on the button // Create the model setModel(new DefaultButtonModel()); // initialize init(text, icon);

Methods Summary
protected void	configurePropertiesFromAction(javax.swing.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. param a the Action from which to get the properties, or null since 1.3 see Action see #setAction super.configurePropertiesFromAction(a);
public javax.accessibility.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. return an AccessibleJButton that serves as the AccessibleContext of this JButton beaninfo expert: true description: The AccessibleContext associated with this Button. if (accessibleContext == null) { accessibleContext = new AccessibleJButton(); } return accessibleContext;
public java.lang.String	getUIClassID() Returns a string that specifies the name of the L&F class that renders this component. return the string "ButtonUI" see JComponent#getUIClassID see UIDefaults#getUI beaninfo expert: true description: A string that specifies the name of the L&F class. return uiClassID;
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. return the value of the defaultButton property see JRootPane#setDefaultButton see #isDefaultCapable beaninfo description: Whether or not this button is the default button JRootPane root = SwingUtilities.getRootPane(this); if (root != null) { return root.getDefaultButton() == this; } return false;
public boolean	isDefaultCapable() Gets the value of the defaultCapable property. return the value of the defaultCapable property see #setDefaultCapable see #isDefaultButton see JRootPane#setDefaultButton return defaultCapable;
protected java.lang.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. return a string representation of this JButton String defaultCapableString = (defaultCapable ? "true" : "false"); return super.paramString() + ",defaultCapable=" + defaultCapableString;
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. JRootPane root = SwingUtilities.getRootPane(this); if (root != null && root.getDefaultButton() == this) { root.setDefaultButton(null); } super.removeNotify();
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. param defaultCapable true if this button will be capable of being the default button on the RootPane; otherwise false see #isDefaultCapable beaninfo bound: true attribute: visualUpdate true description: Whether or not this button can be the default button boolean oldDefaultCapable = this.defaultCapable; this.defaultCapable = defaultCapable; firePropertyChange("defaultCapable", oldDefaultCapable, defaultCapable);
public void	updateUI() Resets the UI property to a value from the current look and feel. see JComponent#updateUI 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); } }