Java by API/javax.swing/JMenuBar

JMenuBar: add(JComponent com)

   <source lang="java">

import java.awt.event.KeyEvent; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JRadioButtonMenuItem; public class MainClass {

 public static void main(String args[]) {
   JFrame f = new JFrame("JRadioButtonMenuItem Sample");
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JMenuBar bar = new JMenuBar();
   JMenu menu = new JMenu("Options");
   menu.setMnemonic(KeyEvent.VK_O);
   ButtonGroup group = new ButtonGroup();
   JRadioButtonMenuItem menuItem = new JRadioButtonMenuItem("A");
   group.add(menuItem);
   menu.add(menuItem);
   menuItem = new JRadioButtonMenuItem("B");
   group.add(menuItem);
   menu.add(menuItem);
   menuItem = new JRadioButtonMenuItem("C");
   group.add(menuItem);
   menu.add(menuItem);
   bar.add(menu);
   f.setJMenuBar(bar);
   f.setSize(300, 200);
   f.setVisible(true);
 }

}

 </source>
   
  
 
  

JMenuBar: setLayout(LayoutManager mgr)

   <source lang="java">

/*

*
* Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/

import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import javax.swing.BorderFactory; import javax.swing.BoxLayout; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JPopupMenu; /**

* @author ges
* @author kwalrath
*/

/* MenuLayoutDemo.java requires no other files. */ public class Main {

 public JMenuBar createMenuBar() {
   JMenuBar menuBar = new JMenuBar();
   menuBar.setLayout(new BoxLayout(menuBar, BoxLayout.PAGE_AXIS));
   menuBar.add(createMenu("Menu 1"));
   menuBar.add(createMenu("Menu 2"));
   menuBar.add(createMenu("Menu 3"));
   menuBar.setBorder(BorderFactory.createMatteBorder(0, 0, 0, 1, Color.BLACK));
   return menuBar;
 }
 // used by createMenuBar
 public JMenu createMenu(String title) {
   JMenu m = new HorizontalMenu(title);
   m.add("Menu item #1 in " + title);
   m.add("Menu item #2 in " + title);
   m.add("Menu item #3 in " + title);
   JMenu submenu = new HorizontalMenu("Submenu");
   submenu.add("Submenu item #1");
   submenu.add("Submenu item #2");
   m.add(submenu);
   return m;
 }
 /**
  * Create the GUI and show it. For thread safety, this method should be
  * invoked from the event-dispatching thread.
  */
 private static void createAndShowGUI() {
   // Create and set up the window.
   JFrame frame = new JFrame("MenuLayoutDemo");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   // Create and set up the content pane.
   Main demo = new Main();
   Container contentPane = frame.getContentPane();
   contentPane.setBackground(Color.WHITE); // contrasting bg
   contentPane.add(demo.createMenuBar(), BorderLayout.LINE_START);
   // Display the window.
   frame.setSize(300, 150);
   frame.setVisible(true);
 }
 public static void main(String[] args) {
   // Schedule a job for the event-dispatching thread:
   // creating and showing this application"s GUI.
   javax.swing.SwingUtilities.invokeLater(new Runnable() {
     public void run() {
       createAndShowGUI();
     }
   });
 }
 class HorizontalMenu extends JMenu {
   HorizontalMenu(String label) {
     super(label);
     JPopupMenu pm = getPopupMenu();
     pm.setLayout(new BoxLayout(pm, BoxLayout.LINE_AXIS));
   }
   public Dimension getMinimumSize() {
     return getPreferredSize();
   }
   public Dimension getMaximumSize() {
     return getPreferredSize();
   }
   public void setPopupMenuVisible(boolean b) {
     boolean isVisible = isPopupMenuVisible();
     if (b != isVisible) {
       if ((b == true) && isShowing()) {
         // Set location of popupMenu (pulldown or pullright).
         // Perhaps this should be dictated by L&F.
         int x = 0;
         int y = 0;
         Container parent = getParent();
         if (parent instanceof JPopupMenu) {
           x = 0;
           y = getHeight();
         } else {
           x = getWidth();
           y = 0;
         }
         getPopupMenu().show(this, x, y);
       } else {
         getPopupMenu().setVisible(false);
       }
     }
   }
 }

}

 </source>