SWING - JMenuBar Class
Introduction
The JMenuBar class provides an implementation of a menu bar.
Class declaration
Following is the declaration for javax.swing.JMenuBar class:
public class JMenuBar extends JComponent implements Accessible, MenuElement
Class constructors
S.N. | Constructor & Description |
---|---|
1 | JMenuBar() Creates a new menu bar. |
Class methods
S.N. | Method & Description |
---|---|
1 | JMenu add(JMenu c) Appends the specified menu to the end of the menu bar. |
2 | void addNotify() Overrides JComponent.addNotify to register this menu bar with the current keyboard manager. |
3 | AccessibleContext getAccessibleContext() Gets the AccessibleContext associated with this JMenuBar. |
4 | Component getComponent() Implemented to be a MenuElement. |
5 | Component getComponentAtIndex(int i) Deprecated. replaced by getComponent(int i) |
6 | int getComponentIndex(Component c) Returns the index of the specified component. |
7 | JMenu getHelpMenu() Gets the help menu for the menu bar. |
8 | Insets getMargin() Returns the margin between the menubar's border and its menus. |
9 | JMenu getMenu(int index) Returns the menu at the specified position in the menu bar. |
10 | int getMenuCount() Returns the number of items in the menu bar. |
11 | SingleSelectionModel getSelectionModel() Returns the model object that handles single selections. |
12 | MenuElement[] getSubElements() Implemented to be a MenuElement -- returns the menus in this menu bar. |
13 | MenuBarUI getUI() Returns the menubar's current UI. |
14 | String getUIClassID() Returns the name of the L&F class that renders this component. |
16 | boolean isBorderPainted() Returns true if the menu bars border should be painted. |
17 | boolean isSelected() Returns true if the menu bar currently has a component selected. |
18 | void menuSelectionChanged(boolean isIncluded) Implemented to be a MenuElement -- does nothing. |
19 | protected void paintBorder(Graphics g) Paints the menubar's border if BorderPainted property is true. |
20 | protected String paramString() Returns a string representation of this JMenuBar. |
21 | protected boolean processKeyBinding(KeyStroke ks, KeyEvent e, int condition, boolean pressed) Subclassed to check all the child menus. |
22 | void processKeyEvent(KeyEvent e, MenuElement[] path, MenuSelectionManager manager) Implemented to be a MenuElement -- does nothing. |
23 | void processMouseEvent(MouseEvent event, MenuElement[] path, MenuSelectionManager manager) Implemented to be a MenuElement -- does nothing. |
22 | void removeNotify() Overrides JComponent.removeNotify to unregister this menu bar with the current keyboard manager. |
23 | void setBorderPainted(boolean b) Sets whether the border should be painted. |
24 | void setHelpMenu(JMenu menu) Sets the help menu that appears when the user selects the "help" option in the menu bar. |
25 | void setMargin(Insets m) Sets the margin between the menubar's border and its menus. |
26 | void setSelected(Component sel) Sets the currently selected component, producing a a change to the selection model. |
27 | void setSelectionModel(SingleSelectionModel model) Sets the model object to handle single selections. |
28 | void setUI(MenuBarUI ui) Sets the L&F object that renders this component. |
29 | void updateUI() Resets the UI property with a value from the current look and feel. |
Methods inherited
This class inherits methods from the following classes:
javax.swing.JComponent
java.awt.Container
java.awt.Component
java.lang.Object
JMenuBar Example
Create the following java program using any editor of your choice in say D:/ > SWING > com > tutorialspoint > gui >
SwingMenuDemo.javapackage com.tutorialspoint.gui; import java.awt.*; import java.awt.event.*; public class SwingMenuDemo { private JFrame mainFrame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; public SwingMenuDemo(){ prepareGUI(); } public static void main(String[] args){ SwingMenuDemo swingMenuDemo = new SwingMenuDemo(); swingMenuDemo.showMenuDemo(); } private void prepareGUI(){ mainFrame = new JFrame("Java SWING Examples"); mainFrame.setSize(400,400); mainFrame.setLayout(new GridLayout(3, 1)); headerLabel = new JLabel("",JLabel.CENTER ); statusLabel = new JLabel("",JLabel.CENTER); statusLabel.setSize(350,100); mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ System.exit(0); } }); controlPanel = new JPanel(); controlPanel.setLayout(new FlowLayout()); mainFrame.add(headerLabel); mainFrame.add(controlPanel); mainFrame.add(statusLabel); mainFrame.setVisible(true); } private void showMenuDemo(){ //create a menu bar final JMenuBar menuBar = new JMenuBar(); //create menus JMenu fileMenu = new JMenu("File"); JMenu editMenu = new JMenu("Edit"); final JMenu aboutMenu = new JMenu("About"); final JMenu linkMenu = new JMenu("Links"); //create menu items JMenuItem newMenuItem = new JMenuItem("New"); newMenuItem.setMnemonic(KeyEvent.VK_N); newMenuItem.setActionCommand("New"); JMenuItem openMenuItem = new JMenuItem("Open"); openMenuItem.setActionCommand("Open"); JMenuItem saveMenuItem = new JMenuItem("Save"); saveMenuItem.setActionCommand("Save"); JMenuItem exitMenuItem = new JMenuItem("Exit"); exitMenuItem.setActionCommand("Exit"); JMenuItem cutMenuItem = new JMenuItem("Cut"); cutMenuItem.setActionCommand("Cut"); JMenuItem copyMenuItem = new JMenuItem("Copy"); copyMenuItem.setActionCommand("Copy"); JMenuItem pasteMenuItem = new JMenuItem("Paste"); pasteMenuItem.setActionCommand("Paste"); MenuItemListener menuItemListener = new MenuItemListener(); newMenuItem.addActionListener(menuItemListener); openMenuItem.addActionListener(menuItemListener); saveMenuItem.addActionListener(menuItemListener); exitMenuItem.addActionListener(menuItemListener); cutMenuItem.addActionListener(menuItemListener); copyMenuItem.addActionListener(menuItemListener); pasteMenuItem.addActionListener(menuItemListener); final JCheckBoxMenuItem showWindowMenu = new JCheckBoxMenuItem("Show About", true); showWindowMenu.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { if(showWindowMenu.getState()){ menuBar.add(aboutMenu); }else{ menuBar.remove(aboutMenu); } } }); final JRadioButtonMenuItem showLinksMenu = new JRadioButtonMenuItem("Show Links", true); showLinksMenu.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { if(menuBar.getMenu(3)!= null){ menuBar.remove(linkMenu); mainFrame.repaint(); }else{ menuBar.add(linkMenu); mainFrame.repaint(); } } }); //add menu items to menus fileMenu.add(newMenuItem); fileMenu.add(openMenuItem); fileMenu.add(saveMenuItem); fileMenu.addSeparator(); fileMenu.add(showWindowMenu); fileMenu.addSeparator(); fileMenu.add(showLinksMenu); fileMenu.addSeparator(); fileMenu.add(exitMenuItem); editMenu.add(cutMenuItem); editMenu.add(copyMenuItem); editMenu.add(pasteMenuItem); //add menu to menubar menuBar.add(fileMenu); menuBar.add(editMenu); menuBar.add(aboutMenu); menuBar.add(linkMenu); //add menubar to the frame mainFrame.setJMenuBar(menuBar); mainFrame.setVisible(true); } class MenuItemListener implements ActionListener { public void actionPerformed(ActionEvent e) { statusLabel.setText(e.getActionCommand() + " JMenuItem clicked."); } } }
Compile the program using command prompt. Go to D:/ > SWING and type the following command.
D:\SWING>javac com\tutorialspoint\gui\SwingMenuDemo.java
If no error comes that means compilation is successful. Run the program using following command.
D:\SWING>java com.tutorialspoint.gui.SwingMenuDemo
Verify the following output
![SWING JMenuBar](/swing/images/swing_jmenubar.jpg)