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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.swing;

import java.util.EventListener;

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;

import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;

import javax.swing.plaf.*;
import javax.accessibility.*;


An implementation of a radio button menu item.
A JRadioButtonMenuItem is
a menu item that is part of a group of menu items in which only one
item in the group can be selected. The selected item displays its
selected state. Selecting it causes any other selected item to
switch to the unselected state.
To control the selected state of a group of radio button menu items,
use a ButtonGroup object.


Menu items can be configured, and to some degree controlled, by
Actions.  Using an
Action with a menu item has many benefits beyond directly
configuring a menu item.  Refer to 
Swing Components Supporting Action for more
details, and you can find more information in How
to Use Actions, a section in The Java Tutorial.


For further documentation and examples see
How to Use Menus,
a section in The Java Tutorial.


Warning: Swing is not thread safe. For more
information see Swing's Threading
Policy.


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™
has been added to the java.beans package. Please see XMLEncoder. 
Author:Georges Saab, David Karlton
See Also:
@beaninfo
  attribute: isContainer false
description: A component within a group of menu items which can be selected.
/**
 * An implementation of a radio button menu item.
 * A <code>JRadioButtonMenuItem</code> is
 * a menu item that is part of a group of menu items in which only one
 * item in the group can be selected. The selected item displays its
 * selected state. Selecting it causes any other selected item to
 * switch to the unselected state.
 * To control the selected state of a group of radio button menu items,
 * use a <code>ButtonGroup</code> object.
 * <p>
 * Menu items can be configured, and to some degree controlled, by
 * <code><a href="Action.html">Action</a></code>s.  Using an
 * <code>Action</code> with a menu item has many benefits beyond directly
 * configuring a menu item.  Refer to <a href="Action.html#buttonActions">
 * Swing Components Supporting <code>Action</code></a> for more
 * details, and you can find more information in <a
 * href="https://docs.oracle.com/javase/tutorial/uiswing/misc/action.html">How
 * to Use Actions</a>, a section in <em>The Java Tutorial</em>.
 * <p>
 * For further documentation and examples see
 * <a
 href="https://docs.oracle.com/javase/tutorial/uiswing/components/menu.html">How to Use Menus</a>,
 * a section in <em>The Java Tutorial.</em>
 * <p>
 * <strong>Warning:</strong> Swing is not thread safe. For more
 * information see <a
 * href="package-summary.html#threading">Swing's Threading
 * Policy</a>.
 * <p>
 * <strong>Warning:</strong>
 * 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&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @beaninfo
 *   attribute: isContainer false
 * description: A component within a group of menu items which can be selected.
 *
 * @author Georges Saab
 * @author David Karlton
 * @see ButtonGroup
 */
public class JRadioButtonMenuItem extends JMenuItem implements Accessible {
    
See Also:
/**
     * @see #getUIClassID
     * @see #readObject
     */
    private static final String uiClassID = "RadioButtonMenuItemUI";

    
Creates a JRadioButtonMenuItem with no set text or icon.

/**
     * Creates a <code>JRadioButtonMenuItem</code> with no set text or icon.
     */
    public JRadioButtonMenuItem() {
        this(null, null, false);
    }

    
Creates a JRadioButtonMenuItem with an icon.

Params:
  • icon – the Icon to display on the
         JRadioButtonMenuItem
/**
     * Creates a <code>JRadioButtonMenuItem</code> with an icon.
     *
     * @param icon the <code>Icon</code> to display on the
     *          <code>JRadioButtonMenuItem</code>
     */
    public JRadioButtonMenuItem(Icon icon) {
        this(null, icon, false);
    }

    
Creates a JRadioButtonMenuItem with text.

Params:
  • text – the text of the JRadioButtonMenuItem
/**
     * Creates a <code>JRadioButtonMenuItem</code> with text.
     *
     * @param text the text of the <code>JRadioButtonMenuItem</code>
     */
    public JRadioButtonMenuItem(String text) {
        this(text, null, false);
    }

    
Creates a radio button menu item whose properties are taken from the
Action supplied.

Params:
  • a – the Action on which to base the radio
         button menu item
Since:1.3
/**
     * Creates a radio button menu item whose properties are taken from the
     * <code>Action</code> supplied.
     *
     * @param  a the <code>Action</code> on which to base the radio
     *          button menu item
     *
     * @since 1.3
     */
    public JRadioButtonMenuItem(Action a) {
        this();
        setAction(a);
    }

    
Creates a radio button menu item with the specified text
and Icon.

Params:
  • text – the text of the JRadioButtonMenuItem
  • icon – the icon to display on the JRadioButtonMenuItem
/**
     * Creates a radio button menu item with the specified text
     * and <code>Icon</code>.
     *
     * @param text the text of the <code>JRadioButtonMenuItem</code>
     * @param icon the icon to display on the <code>JRadioButtonMenuItem</code>
     */
    public JRadioButtonMenuItem(String text, Icon icon) {
        this(text, icon, false);
    }

    
Creates a radio button menu item with the specified text
and selection state.

Params:
  • text – the text of the CheckBoxMenuItem
  • selected – the selected state of the CheckBoxMenuItem
/**
     * Creates a radio button menu item with the specified text
     * and selection state.
     *
     * @param text the text of the <code>CheckBoxMenuItem</code>
     * @param selected the selected state of the <code>CheckBoxMenuItem</code>
     */
    public JRadioButtonMenuItem(String text, boolean selected) {
        this(text);
        setSelected(selected);
    }

    
Creates a radio button menu item with the specified image
and selection state, but no text.

Params:
  • icon –  the image that the button should display
  • selected –  if true, the button is initially selected;
                 otherwise, the button is initially unselected
/**
     * Creates a radio button menu item with the specified image
     * and selection state, but no text.
     *
     * @param icon  the image that the button should display
     * @param selected  if true, the button is initially selected;
     *                  otherwise, the button is initially unselected
     */
    public JRadioButtonMenuItem(Icon icon, boolean selected) {
        this(null, icon, selected);
    }

    
Creates a radio button menu item that has the specified
text, image, and selection state.  All other constructors
defer to this one.

Params:
  • text –  the string displayed on the radio button
  • icon –  the image that the button should display
/**
     * Creates a radio button menu item that has the specified
     * text, image, and selection state.  All other constructors
     * defer to this one.
     *
     * @param text  the string displayed on the radio button
     * @param icon  the image that the button should display
     */
    public JRadioButtonMenuItem(String text, Icon icon, boolean selected) {
        super(text, icon);
        setModel(new JToggleButton.ToggleButtonModel());
        setSelected(selected);
        setFocusable(false);
    }

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

See Also:
Returns:the string "RadioButtonMenuItemUI"
/**
     * Returns the name of the L&amp;F class that renders this component.
     *
     * @return the string "RadioButtonMenuItemUI"
     * @see JComponent#getUIClassID
     * @see UIDefaults#getUI
     */
    public String getUIClassID() {
        return uiClassID;
    }

    
See readObject and writeObject in
JComponent for more
information about serialization in Swing.

/**
     * See <code>readObject</code> and <code>writeObject</code> in
     * <code>JComponent</code> for more
     * information about serialization in Swing.
     */
    private void writeObject(ObjectOutputStream s) throws IOException {
        s.defaultWriteObject();
        if (getUIClassID().equals(uiClassID)) {
            byte count = JComponent.getWriteObjCounter(this);
            JComponent.setWriteObjCounter(this, --count);
            if (count == 0 && ui != null) {
                ui.installUI(this);
            }
        }
    }


    
Returns a string representation of this
JRadioButtonMenuItem.  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.

Returns: a string representation of this
         JRadioButtonMenuItem
/**
     * Returns a string representation of this
     * <code>JRadioButtonMenuItem</code>.  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 <code>null</code>.
     *
     * @return  a string representation of this
     *          <code>JRadioButtonMenuItem</code>
     */
    protected String paramString() {
        return super.paramString();
    }

    
Overriden to return true, JRadioButtonMenuItem supports
the selected state.

/**
     * Overriden to return true, JRadioButtonMenuItem supports
     * the selected state.
     */
    boolean shouldUpdateSelectedStateFromAction() {
        return true;
    }

/////////////////
// Accessibility support
////////////////

    
Gets the AccessibleContext associated with this JRadioButtonMenuItem.
For JRadioButtonMenuItems, the AccessibleContext takes the form of an
AccessibleJRadioButtonMenuItem.
A new AccessibleJRadioButtonMenuItem instance is created if necessary.

Returns:an AccessibleJRadioButtonMenuItem that serves as the
        AccessibleContext of this JRadioButtonMenuItem
/**
     * Gets the AccessibleContext associated with this JRadioButtonMenuItem.
     * For JRadioButtonMenuItems, the AccessibleContext takes the form of an
     * AccessibleJRadioButtonMenuItem.
     * A new AccessibleJRadioButtonMenuItem instance is created if necessary.
     *
     * @return an AccessibleJRadioButtonMenuItem that serves as the
     *         AccessibleContext of this JRadioButtonMenuItem
     */
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null) {
            accessibleContext = new AccessibleJRadioButtonMenuItem();
        }
        return accessibleContext;
    }

    
This class implements accessibility support for the
JRadioButtonMenuItem class.  It provides an
implementation of the Java Accessibility API appropriate to
JRadioButtonMenuItem user-interface elements.


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™
has been added to the java.beans package. Please see XMLEncoder. 
/**
     * This class implements accessibility support for the
     * <code>JRadioButtonMenuItem</code> class.  It provides an
     * implementation of the Java Accessibility API appropriate to
     * <code>JRadioButtonMenuItem</code> user-interface elements.
     * <p>
     * <strong>Warning:</strong>
     * 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&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    protected class AccessibleJRadioButtonMenuItem extends AccessibleJMenuItem {
        
Get the role of this object.

Returns:an instance of AccessibleRole describing the role of the
object
/**
         * Get the role of this object.
         *
         * @return an instance of AccessibleRole describing the role of the
         * object
         */
        public AccessibleRole getAccessibleRole() {
            return AccessibleRole.RADIO_BUTTON;
        }
    } // inner class AccessibleJRadioButtonMenuItem
}