37 import java.util.Enumeration;
  38 
  39 import java.io.Serializable;
  40 import java.io.ObjectOutputStream;
  41 import java.io.ObjectInputStream;
  42 import java.io.IOException;
  43 
  44 import javax.swing.event.*;
  45 import javax.swing.border.Border;
  46 import javax.swing.plaf.*;
  47 import javax.accessibility.*;
  48 
  49 /**
  50  * An implementation of a menu bar. You add <code>JMenu</code> objects to the
  51  * menu bar to construct a menu. When the user selects a <code>JMenu</code>
  52  * object, its associated <code>JPopupMenu</code> is displayed, allowing the
  53  * user to select one of the <code>JMenuItems</code> on it.
  54  * <p>
  55  * For information and examples of using menu bars see
  56  * <a
  57  href="http://java.sun.com/docs/books/tutorial/uiswing/components/menu.html">How to Use Menus</a>,
  58  * a section in <em>The Java Tutorial.</em>
  59  * <p>
  60  * <strong>Warning:</strong> Swing is not thread safe. For more
  61  * information see <a
  62  * href="package-summary.html#threading">Swing's Threading
  63  * Policy</a>.
  64  * <p>
  65  * <strong>Warning:</strong>
  66  * Serialized objects of this class will not be compatible with
  67  * future Swing releases. The current serialization support is
  68  * appropriate for short term storage or RMI between applications running
  69  * the same version of Swing.  As of 1.4, support for long term storage
  70  * of all JavaBeans<sup><font size="-2">TM</font></sup>
  71  * has been added to the <code>java.beans</code> package.
  72  * Please see {@link java.beans.XMLEncoder}.
  73  * <p>
  74  * <strong>Warning:</strong>
  75  * By default, pressing the Tab key does not transfer focus from a <code>
  76  * JMenuBar</code> which is added to a container together with other Swing
  77  * components, because the <code>focusTraversalKeysEnabled</code> property

  37 import java.util.Enumeration;
  38 
  39 import java.io.Serializable;
  40 import java.io.ObjectOutputStream;
  41 import java.io.ObjectInputStream;
  42 import java.io.IOException;
  43 
  44 import javax.swing.event.*;
  45 import javax.swing.border.Border;
  46 import javax.swing.plaf.*;
  47 import javax.accessibility.*;
  48 
  49 /**
  50  * An implementation of a menu bar. You add <code>JMenu</code> objects to the
  51  * menu bar to construct a menu. When the user selects a <code>JMenu</code>
  52  * object, its associated <code>JPopupMenu</code> is displayed, allowing the
  53  * user to select one of the <code>JMenuItems</code> on it.
  54  * <p>
  55  * For information and examples of using menu bars see
  56  * <a
  57  href="http://docs.oracle.com/javase/tutorial/uiswing/components/menu.html">How to Use Menus</a>,
  58  * a section in <em>The Java Tutorial.</em>
  59  * <p>
  60  * <strong>Warning:</strong> Swing is not thread safe. For more
  61  * information see <a
  62  * href="package-summary.html#threading">Swing's Threading
  63  * Policy</a>.
  64  * <p>
  65  * <strong>Warning:</strong>
  66  * Serialized objects of this class will not be compatible with
  67  * future Swing releases. The current serialization support is
  68  * appropriate for short term storage or RMI between applications running
  69  * the same version of Swing.  As of 1.4, support for long term storage
  70  * of all JavaBeans<sup><font size="-2">TM</font></sup>
  71  * has been added to the <code>java.beans</code> package.
  72  * Please see {@link java.beans.XMLEncoder}.
  73  * <p>
  74  * <strong>Warning:</strong>
  75  * By default, pressing the Tab key does not transfer focus from a <code>
  76  * JMenuBar</code> which is added to a container together with other Swing
  77  * components, because the <code>focusTraversalKeysEnabled</code> property