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 {@link java.beans.XMLEncoder}. 

 public JButton() 
{
                  
        this(null, null);
}

Creates a button with no set text or icon.

 public JButton(Icon icon) 
{
        this(null, icon);
}

Creates a button with an icon.

Parameters:

icon - the Icon image to display on the button

 public JButton(String text) 
{
        this(text, null);
}

Creates a button with text.

Parameters:

text - the text of the button

 public JButton(Action a) 
{
        this();
        setAction(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 -

 public JButton(String text,
    Icon icon) 
{
        // Create the model
        setModel(new DefaultButtonModel());
        // initialize
        init(text, 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

 public AccessibleContext getAccessibleContext() 
{
        if (accessibleContext == null) {
            accessibleContext = new AccessibleJButton();
        }
        return accessibleContext;
}

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.

 public String getUIClassID() 
{
        return uiClassID;
}

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

 public boolean isDefaultButton() 
{
        JRootPane root = SwingUtilities.getRootPane(this);
        if (root != null) {
            return root.getDefaultButton() == this;
        }
        return false;
}

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.

 public boolean isDefaultCapable() 
{
        return defaultCapable;
}

Gets the value of the defaultCapable property.

 protected String paramString() 
{
        String defaultCapableString = (defaultCapable ? "true" : "false");
        return super.paramString() +
            ",defaultCapable=" + defaultCapableString;
}

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.

 public  void removeNotify() 
{
        JRootPane root = SwingUtilities.getRootPane(this);
        if (root != null && root.getDefaultButton() == this) {
            root.setDefaultButton(null);
        }
        super.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.

 public  void setDefaultCapable(boolean defaultCapable) 
{
        boolean oldDefaultCapable = this.defaultCapable;
        this.defaultCapable = defaultCapable;
        firePropertyChange("defaultCapable", oldDefaultCapable, 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.

 public  void updateUI() 
{
        setUI((ButtonUI)UIManager.getUI(this));
}

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