JComboBox

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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:: ActionListener , ImageObserver , ItemSelectable , MenuContainer , Serializable , EventListener , Accessible , ListDataListener

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

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/interfaces inherited from class javax.swing.JComponent
`JComponent.AccessibleJComponent`

Nested classes/interfaces inherited from class java.awt.Container
`Container.AccessibleAWTContainer`

Nested classes/interfaces inherited from class java.awt.Component
`Component.AccessibleAWTComponent , 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 `PopupMenuListener`s that the popup portion of the combo box has been canceled.
`void`	`firePopupMenuWillBecomeInvisible ()` Notifies `PopupMenuListener`s that the popup portion of the combo box has become invisible.
`void`	`firePopupMenuWillBecomeVisible ()` Notifies `PopupMenuListener`s 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 `ActionListener`s 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 `ItemListener`s 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 `PopupMenuListener`s 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 `KeyEvent`s, looking for the Tab key.
`void`	`removeActionListener (ActionListener l)` Removes an `ActionListener`.
`void`	`removeAllItems`

javax.swing Class JComboBox

javax.swing
Class JComboBox