Class JMenuBar

All Implemented Interfaces:
ImageObserver, MenuContainer, Serializable, Accessible, MenuElement
Direct Known Subclasses:
BasicInternalFrameTitlePane.SystemMenuBar
@JavaBean(defaultProperty="UI",
          description="A container for holding and displaying menus.")
public class JMenuBar
extends JComponent
implements Accessible, MenuElement

An implementation of a menu bar. You add JMenu objects to the menu bar to construct a menu. When the user selects a JMenu object, its associated JPopupMenu is displayed, allowing the user to select one of the JMenuItems on it.

For information and examples of using menu bars 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.

Warning: By default, pressing the Tab key does not transfer focus from a JMenuBar which is added to a container together with other Swing components, because the focusTraversalKeysEnabled property of JMenuBar is set to false. To resolve this, you should call the JMenuBar.setFocusTraversalKeysEnabled(true) method.

Since:
1.2
See Also:
JMenu, JPopupMenu, JMenuItem, Serialized Form

Nested Classes

Modifier and Type Class Description
protected class  JMenuBar.AccessibleJMenuBar

This class implements accessibility support for the JMenuBar class.

Nested classes/interfaces declared in class javax.swing.JComponent

JComponent.AccessibleJComponent

Nested classes/interfaces declared in class java.awt.Container

Container.AccessibleAWTContainer

Nested classes/interfaces declared in class java.awt.Component

Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Fields

Fields declared in class javax.swing.JComponent

listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

Fields declared in class java.awt.Component

accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields declared in interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructors

Constructor Description
JMenuBar()

Creates a new menu bar.

Methods

Modifier and Type Method Description
JMenu add​(JMenu c)

Appends the specified menu to the end of the menu bar.
void addNotify()

Overrides JComponent.addNotify to register this menu bar with the current keyboard manager.
AccessibleContext getAccessibleContext()

Gets the AccessibleContext associated with this JMenuBar.
Component getComponent()

Implemented to be a MenuElement.
Component getComponentAtIndex​(int i)

Deprecated.

replaced by getComponent(int i)

int getComponentIndex​(Component c)

Returns the index of the specified component.
JMenu getHelpMenu()

Gets the help menu for the menu bar.
Insets getMargin()

Returns the margin between the menubar's border and its menus.
JMenu getMenu​(int index)

Returns the menu at the specified position in the menu bar.
int getMenuCount()

Returns the number of items in the menu bar.
SingleSelectionModel getSelectionModel()

Returns the model object that handles single selections.
MenuElement[] getSubElements()

Implemented to be a MenuElement -- returns the menus in this menu bar.
MenuBarUI getUI()

Returns the menubar's current UI.
String getUIClassID()

Returns the name of the L&F class that renders this component.
boolean isBorderPainted()

Returns true if the menu bars border should be painted.
boolean isSelected()

Returns true if the menu bar currently has a component selected.
void menuSelectionChanged​(boolean isIncluded)

Implemented to be a MenuElement -- does nothing.
protected void paintBorder​(Graphics g)

Paints the menubar's border if BorderPainted property is true.
protected String paramString()

Returns a string representation of this JMenuBar.
protected boolean processKeyBinding​(KeyStroke ks, KeyEvent e, int condition, boolean pressed)

Subclassed to check all the child menus.
void processKeyEvent​(KeyEvent e, MenuElement[] path, MenuSelectionManager manager)

Implemented to be a MenuElement -- does nothing.
void processMouseEvent​(MouseEvent event, MenuElement[] path, MenuSelectionManager manager)

Implemented to be a MenuElement -- does nothing.
void removeNotify()

Overrides JComponent.removeNotify to unregister this menu bar with the current keyboard manager.
void setBorderPainted​(boolean b)

Sets whether the border should be painted.
void setHelpMenu​(JMenu menu)

Sets the help menu that appears when the user selects the "help" option in the menu bar.
void setMargin​(Insets m)

Sets the margin between the menubar's border and its menus.
void setSelected​(Component sel)

Sets the currently selected component, producing a a change to the selection model.
void setSelectionModel​(SingleSelectionModel model)

Sets the model object to handle single selections.
void setUI​(MenuBarUI ui)

Sets the L&F object that renders this component.
void updateUI()

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

Methods declared in class javax.swing.JComponent

addAncestorListener, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingOrigin, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

Methods declared in class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusDownCycle, validate, validateTree

Methods declared in class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setMixingCutoutShape, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructors

JMenuBar

public JMenuBar()

Creates a new menu bar.

Methods

getUI

public MenuBarUI getUI()

Returns the menubar's current UI.

Overrides:
getUI in class JComponent
Returns:
a MenuBarUI which is the menubar's current L&F object
See Also:
setUI(javax.swing.plaf.MenuBarUI)

setUI

@BeanProperty(hidden=true,
              visualUpdate=true,
              description="The UI object that implements the Component\'s LookAndFeel.")
public void setUI(MenuBarUI ui)

Sets the L&F object that renders this component.

Parameters:
ui - the new MenuBarUI L&F object
See Also:
UIDefaults.getUI(javax.swing.JComponent)

updateUI

public void updateUI()

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

Overrides:
updateUI in class JComponent
See Also:
JComponent.updateUI()

getUIClassID

@BeanProperty(bound=false)
public String getUIClassID()

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

Overrides:
getUIClassID in class JComponent
Returns:
the string "MenuBarUI"
See Also:
JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

getSelectionModel

public SingleSelectionModel getSelectionModel()

Returns the model object that handles single selections.

Returns:
the SingleSelectionModel property
See Also:
SingleSelectionModel

setSelectionModel

@BeanProperty(description="The selection model, recording which child is selected.")
public void setSelectionModel(SingleSelectionModel model)

Sets the model object to handle single selections.

Parameters:
model - the SingleSelectionModel to use
See Also:
SingleSelectionModel

add

public JMenu add(JMenu c)

Appends the specified menu to the end of the menu bar.

Parameters:
c - the JMenu component to add
Returns:
the menu component

getMenu

public JMenu getMenu(int index)

Returns the menu at the specified position in the menu bar.

Parameters:
index - an integer giving the position in the menu bar, where 0 is the first position
Returns:
the JMenu at that position, or null if if there is no JMenu at that position (ie. if it is a JMenuItem)

getMenuCount

@BeanProperty(bound=false)
public int getMenuCount()

Returns the number of items in the menu bar.

Returns:
the number of items in the menu bar

setHelpMenu

public void setHelpMenu(JMenu menu)

Sets the help menu that appears when the user selects the "help" option in the menu bar. This method is not yet implemented and will throw an exception.

Parameters:
menu - the JMenu that delivers help to the user

getHelpMenu

public JMenu getHelpMenu()

Gets the help menu for the menu bar. This method is not yet implemented and will throw an exception.

Returns:
the JMenu that delivers help to the user

getComponentAtIndex

@Deprecated
public Component getComponentAtIndex(int i)
Deprecated.
replaced by getComponent(int i)

Returns the component at the specified index.

Parameters:
i - an integer specifying the position, where 0 is first
Returns:
the Component at the position, or null for an invalid index

getComponentIndex

public int getComponentIndex(Component c)

Returns the index of the specified component.

Parameters:
c - the Component to find
Returns:
an integer giving the component's position, where 0 is first; or -1 if it can't be found

setSelected

public void setSelected(Component sel)

Sets the currently selected component, producing a a change to the selection model.

Parameters:
sel - the Component to select

isSelected

@BeanProperty(bound=false)
public boolean isSelected()

Returns true if the menu bar currently has a component selected.

Returns:
true if a selection has been made, else false

isBorderPainted

public boolean isBorderPainted()

Returns true if the menu bars border should be painted.

Returns:
true if the border should be painted, else false

setBorderPainted

@BeanProperty(visualUpdate=true,
              description="Whether the border should be painted.")
public void setBorderPainted(boolean b)

Sets whether the border should be painted.

Parameters:
b - if true and border property is not null, the border is painted.
See Also:
isBorderPainted()

paintBorder

protected void paintBorder(Graphics g)

Paints the menubar's border if BorderPainted property is true.

Overrides:
paintBorder in class JComponent
Parameters:
g - the Graphics context to use for painting
See Also:
JComponent.paint(java.awt.Graphics), JComponent.setBorder(javax.swing.border.Border)

setMargin

@BeanProperty(visualUpdate=true,
              description="The space between the menubar\'s border and its contents")
public void setMargin(Insets m)

Sets the margin between the menubar's border and its menus. Setting to null will cause the menubar to use the default margins.

Parameters:
m - an Insets object containing the margin values
See Also:
Insets

getMargin

public Insets getMargin()

Returns the margin between the menubar's border and its menus. If there is no previous margin, it will create a default margin with zero size.

Returns:
an Insets object containing the margin values
See Also:
Insets

processMouseEvent

public void processMouseEvent(MouseEvent event,
                              MenuElement[] path,
                              MenuSelectionManager manager)

Implemented to be a MenuElement -- does nothing.

Specified by:
processMouseEvent in interface MenuElement
Parameters:
event - a MouseEvent to be processed
path - the path of the receiving element in the menu hierarchy
manager - the MenuSelectionManager for the menu hierarchy
See Also:
getSubElements()

processKeyEvent

public void processKeyEvent(KeyEvent e,
                            MenuElement[] path,
                            MenuSelectionManager manager)

Implemented to be a MenuElement -- does nothing.

Specified by:
processKeyEvent in interface MenuElement
Parameters:
e - a KeyEvent to be processed
path - the path of the receiving element in the menu hierarchy
manager - the MenuSelectionManager for the menu hierarchy
See Also:
getSubElements()
public void menuSelectionChanged(boolean isIncluded)

Implemented to be a MenuElement -- does nothing.

Specified by:
menuSelectionChanged in interface MenuElement
Parameters:
isIncluded - can be used to indicate if this MenuElement is active (if it is a menu) or is on the part of the menu path that changed (if it is a menu item).
See Also:
getSubElements()

getSubElements

@BeanProperty(bound=false)
public MenuElement[] getSubElements()

Implemented to be a MenuElement -- returns the menus in this menu bar. This is the reason for implementing the MenuElement interface -- so that the menu bar can be treated the same as other menu elements.

Specified by:
getSubElements in interface MenuElement
Returns:
an array of menu items in the menu bar.

getComponent

public Component getComponent()

Implemented to be a MenuElement. Returns this object.

Specified by:
getComponent in interface MenuElement
Returns:
the current Component (this)
See Also:
getSubElements()

paramString

protected String paramString()

Returns a string representation of this JMenuBar. 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.

Overrides:
paramString in class JComponent
Returns:
a string representation of this JMenuBar

getAccessibleContext

@BeanProperty(bound=false)
public AccessibleContext getAccessibleContext()

Gets the AccessibleContext associated with this JMenuBar. For JMenuBars, the AccessibleContext takes the form of an AccessibleJMenuBar. A new AccessibleJMenuBar instance is created if necessary.

Specified by:
getAccessibleContext in interface Accessible
Overrides:
getAccessibleContext in class Component
Returns:
an AccessibleJMenuBar that serves as the AccessibleContext of this JMenuBar

processKeyBinding

protected boolean processKeyBinding(KeyStroke ks,
                                    KeyEvent e,
                                    int condition,
                                    boolean pressed)

Subclassed to check all the child menus.

Overrides:
processKeyBinding in class JComponent
Parameters:
ks - the KeyStroke queried
e - the KeyEvent
condition - one of the following values:
  • JComponent.WHEN_FOCUSED
  • JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT
  • JComponent.WHEN_IN_FOCUSED_WINDOW
pressed - true if the key is pressed
Returns:
true if there was a binding to an action, and the action was enabled
Since:
1.3

addNotify

public void addNotify()

Overrides JComponent.addNotify to register this menu bar with the current keyboard manager.

Overrides:
addNotify in class JComponent
See Also:
JComponent.registerKeyboardAction(java.awt.event.ActionListener, java.lang.String, javax.swing.KeyStroke, int)

removeNotify

public void removeNotify()

Overrides JComponent.removeNotify to unregister this menu bar with the current keyboard manager.

Overrides:
removeNotify in class JComponent
See Also:
JComponent.registerKeyboardAction(java.awt.event.ActionListener, java.lang.String, javax.swing.KeyStroke, int)

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