JComboBox (Java 2 Platform SE v1.4.0)

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Java^TM 2 Platform
Std. Ed. v1.4.0

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javax.swing
Class JComboBox

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.JComponent
                    |
                    +--javax.swing.JComboBox

All Implemented Interfaces:: Accessible, ActionListener, EventListener, ImageObserver, ItemSelectable, ListDataListener, MenuContainer, Serializable

public class JComboBox
extends JComponent
implements ItemSelectable, ListDataListener, ActionListener, Accessible

A component that combines a button or editable field and a drop-down list. The user can select a value from the drop-down list, which appears at the user's request. If you make the combo box editable, then the combo box includes an editable field into which the user can type a value.

For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JComboBox key assignments.

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^TM has been added to the java.beans package. Please see XMLEncoder.

See How to Use Combo Boxes in The Java Tutorial for further information.

See Also:: ComboBoxModel, DefaultComboBoxModel

Nested Class Summary

protected class JComboBox.AccessibleJComboBox
          This class implements accessibility support for the JComboBox class.

static interface JComboBox.KeySelectionManager
          The interface that defines a KeySelectionManager.

Nested classes inherited from class javax.swing.JComponent

Nested classes inherited from class java.awt.Container

Nested classes inherited from class java.awt.Component

Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

protected String actionCommand
          This protected field is implementation specific.

protected ComboBoxModel dataModel
          This protected field is implementation specific.

protected ComboBoxEditor editor
          This protected field is implementation specific.

protected boolean isEditable
          This protected field is implementation specific.

protected JComboBox.KeySelectionManager keySelectionManager
          This protected field is implementation specific.

protected boolean lightWeightPopupEnabled
          This protected field is implementation specific.

protected int maximumRowCount
          This protected field is implementation specific.

protected ListCellRenderer renderer
          This protected field is implementation specific.

protected Object selectedItemReminder
          This protected field is implementation specific.

Fields inherited from class javax.swing.JComponent

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

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

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

Constructor Summary

JComboBox()
          Creates a JComboBox with a default data model.

JComboBox(ComboBoxModel aModel)
          Creates a JComboBox that takes it's items from an existing ComboBoxModel.

JComboBox(Object[] items)
          Creates a JComboBox that contains the elements in the specified array.

JComboBox(Vector items)
          Creates a JComboBox that contains the elements in the specified Vector.

Method Summary

void actionPerformed(ActionEvent e)
          This method is public as an implementation side effect.

void addActionListener(ActionListener l)
          Adds an ActionListener.

void addItem(Object anObject)
          Adds an item to the item list.

void addItemListener(ItemListener aListener)
          Adds an ItemListener.

void addPopupMenuListener(PopupMenuListener l)
          Adds a PopupMenu listener which will listen to notification messages from the popup portion of the combo box.

void configureEditor(ComboBoxEditor anEditor, Object anItem)
          Initializes the editor with the specified item.

protected void configurePropertiesFromAction(Action a)
          Factory method which sets the ActionEvent source's properties according to values from the Action instance.

void contentsChanged(ListDataEvent e)
          This method is public as an implementation side effect.

protected PropertyChangeListener createActionPropertyChangeListener(Action a)
          Factory method which creates the PropertyChangeListener used to update the ActionEvent source as properties change on its Action instance.

protected JComboBox.KeySelectionManager createDefaultKeySelectionManager()
          Returns an instance of the default key-selection manager.

protected void fireActionEvent()
          Notifies all listeners that have registered interest for notification on this event type.

protected void fireItemStateChanged(ItemEvent e)
          Notifies all listeners that have registered interest for notification on this event type.

void firePopupMenuCanceled()
          Notifies PopupMenuListeners that the popup portion of the combo box has been canceled.

void firePopupMenuWillBecomeInvisible()
          Notifies PopupMenuListeners that the popup portion of the combo box has become invisible.

void firePopupMenuWillBecomeVisible()
          Notifies PopupMenuListeners that the popup portion of the combo box will become visible.

AccessibleContext getAccessibleContext()
          Gets the AccessibleContext associated with this JComboBox.

Action getAction()
          Returns the currently set Action for this ActionEvent source, or null if no Action is set.

String getActionCommand()
          Returns the action command that is included in the event sent to action listeners.

ActionListener[] getActionListeners()
          Returns an array of all the ActionListeners added to this JComboBox with addActionListener().

ComboBoxEditor getEditor()
          Returns the editor used to paint and edit the selected item in the JComboBox field.

Object getItemAt(int index)
          Returns the list item at the specified index.

int getItemCount()
          Returns the number of items in the list.

ItemListener[] getItemListeners()
          Returns an array of all the ItemListeners added to this JComboBox with addItemListener().

JComboBox.KeySelectionManager getKeySelectionManager()
          Returns the list's key-selection manager.

int getMaximumRowCount()
          Returns the maximum number of items the combo box can display without a scrollbar

ComboBoxModel getModel()
          Returns the data model currently used by the JComboBox.

PopupMenuListener[] getPopupMenuListeners()
          Returns an array of all the PopupMenuListeners added to this JComboBox with addPopupMenuListener().

Object getPrototypeDisplayValue()
          Returns the "prototypical display" value - an Object used for the calculation of the display height and width.

ListCellRenderer getRenderer()
          Returns the renderer used to display the selected item in the JComboBox field.

int getSelectedIndex()
          Returns the first item in the list that matches the given item.

Object getSelectedItem()
          Returns the current selected item.

Object[] getSelectedObjects()
          Returns an array containing the selected item.

ComboBoxUI getUI()
          Returns the L&F object that renders this component.

String getUIClassID()
          Returns the name of the L&F class that renders this component.

void hidePopup()
          Causes the combo box to close its popup window.

void insertItemAt(Object anObject, int index)
          Inserts an item into the item list at a given index.

protected void installAncestorListener()


void intervalAdded(ListDataEvent e)
          This method is public as an implementation side effect.

void intervalRemoved(ListDataEvent e)
          This method is public as an implementation side effect.

boolean isEditable()
          Returns true if the JComboBox is editable.

boolean isLightWeightPopupEnabled()
          Gets the value of the lightWeightPopupEnabled property.

boolean isPopupVisible()
          Determines the visibility of the popup.

protected String paramString()
          Returns a string representation of this JComboBox.

void processKeyEvent(KeyEvent e)
          Handles KeyEvents, looking for the Tab key.

void removeActionListener(ActionListener l)
          Removes an ActionListener.

void removeAllItems()
          Removes all items from the item list.

void removeItem(Object anObject)
          Removes an item from the item list.

void removeItemAt(int anIndex)
          Removes the item at anIndex This method works only if the JComboBox uses a mutable data model.

void removeItemListener(ItemListener aListener)
          Removes an ItemListener.

void removePopupMenuListener(PopupMenuListener l)
          Removes a PopupMenuListener.

protected void selectedItemChanged()
          This protected method is implementation specific.

boolean selectWithKeyChar(char keyChar)
          Selects the list item that corresponds to the specified keyboard character and returns true, if there is an item corresponding to that character.

void setAction(Action a)
          Sets the Action for the ActionEvent source.

void setActionCommand(String aCommand)
          Sets the action command that should be included in the event sent to action listeners.

void setEditable(boolean aFlag)
          Determines whether the JComboBox field is editable.

void setEditor(ComboBoxEditor anEditor)
          Sets the editor used to paint and edit the selected item in the JComboBox field.

void setEnabled(boolean b)
          Enables the combo box so that items can be selected.

void setKeySelectionManager(JComboBox.KeySelectionManager aManager)
          Sets the object that translates a keyboard character into a list selection.

void setLightWeightPopupEnabled(boolean aFlag)
          Sets the lightWeightPopupEnabled property, which provides a hint as to whether or not a lightweight Component should be used to contain the JComboBox, versus a heavyweight Component such as a Panel or a Window.

void setMaximumRowCount(int count)
          Sets the maximum number of rows the JComboBox displays.

void setModel(ComboBoxModel aModel)
          Sets the data model that the JComboBox uses to obtain the list of items.

void setPopupVisible(boolean v)
          Sets the visibility of the popup.

void setPrototypeDisplayValue(Object prototypeDisplayValue)
          Sets the prototype display value used to calculate the size of the display for the UI portion.

void setRenderer(ListCellRenderer aRenderer)
          Sets the renderer that paints the list items and the item selected from the list in the JComboBox field.

void setSelectedIndex(int anIndex)
          Selects the item at index anIndex.

void setSelectedItem(Object anObject)
          Sets the selected item in the combo box display area to the object in the argument.

void setUI(ComboBoxUI ui)
          Sets the L&F object that renders this component.

void showPopup()
          Causes the combo box to display its popup window.

void updateUI()
          Resets the UI property to a value from the current look and feel.

Methods inherited from class javax.swing.JComponent

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

Methods inherited from class java.awt.Container

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

Methods inherited from 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, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, 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, processMouseEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusUpCycle

Methods inherited from class java.lang.Object

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

Field Detail