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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/Choice.html below:

Choice (Java SE 19 & JDK 19)

All Implemented Interfaces:

ImageObserver, ItemSelectable, MenuContainer, Serializable, Accessible

The

class presents a pop-up menu of choices. The current choice is displayed as the title of the menu.

The following code example produces a pop-up menu:

 Choice ColorChooser = new Choice();
 ColorChooser.add("Green");
 ColorChooser.add("Red");
 ColorChooser.add("Blue");
 

After this choice menu has been added to a panel, it appears as follows in its normal state:

In the picture, "Green" is the current choice. Pushing the mouse button down on the object causes a menu to appear with the current choice highlighted.

Some native platforms do not support arbitrary resizing of Choice components and the behavior of setSize()/getSize() is bound by such limitations. Native GUI Choice components' size are often bound by such attributes as font size and length of items contained within the Choice.

Since:

1.0

See Also:

• Serialized Form

• Nested Class Summary

  Nested Classes

  protected class 

  This class implements accessibility support for the Choice class.

• Field Summary
• Constructor Summary

  Constructors

  Creates a new choice menu.

• Method Summary

  void

  Adds an item to this Choice menu.

  void

  Obsolete as of Java 2 platform v1.1.

  void

  Adds the specified item listener to receive item events from this Choice menu.

  void

  Creates the Choice's peer.

  int

  Gets the AccessibleContext associated with this Choice.

  Gets the string at the specified index in this Choice menu.

  int

  Returns the number of items in this Choice menu.

  Returns an array of all the item listeners registered on this choice.

  Returns an array of all the objects currently registered as FooListeners upon this Choice.

  int

  Returns the index of the currently selected item.

  Gets a representation of the current choice as a string.

  Returns an array (length 1) containing the currently selected item.

  void

  Inserts the item into this choice at the specified position.

  Returns a string representing the state of this Choice menu.

  protected void

  Processes events on this choice.

  protected void

  Processes item events occurring on this Choice menu by dispatching them to any registered ItemListener objects.

  void

  Removes an item from the choice menu at the specified position.

  void

  Removes the first occurrence of item from the Choice menu.

  void

  Removes all items from the choice menu.

  void

  Removes the specified item listener so that it no longer receives item events from this Choice menu.

  void

  Sets the selected item in this Choice menu to be the item at the specified position.

  void

  Sets the selected item in this Choice menu to be the item whose name is equal to the specified string.

  Methods declared in class java.awt.Componentaction, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getAlignmentX, getAlignmentY, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeys, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paint, paintAll, postEvent, preferredSize, prepareImage, prepareImage, print, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, revalidate, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setMixingCutoutShape, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, update, validate

• Constructor Details
  • Choice

    By default, the first item added to the choice menu becomes the selected item, until a different selection is made by the user by calling one of the select methods.

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless() returns true

    See Also:

    • GraphicsEnvironment.isHeadless()
    • select(int)
    • select(java.lang.String)

• Method Details
  • addNotify

    public void addNotify()

    Creates the Choice's peer. This peer allows us to change the look of the Choice without changing its functionality.

    Overrides:

    addNotify in class Component

    See Also:

    • Component.getToolkit()

  • getItemCount

    public int getItemCount()

    Returns the number of items in this Choice menu.

    Returns:

    the number of items in this Choice menu

    Since:

    1.1

    See Also:

    • getItem(int)

  • countItems

    Returns the number of items in this Choice menu.

    Returns:

    the number of items in this Choice menu

  • getItem public String getItem(int index)

    Gets the string at the specified index in this Choice menu.

    Parameters:

    index - the index at which to begin

    Returns:

    the item at the specified index

    See Also:

    • getItemCount()

  • add

    Adds an item to this Choice menu.

    Parameters:

    item - the item to be added

    Throws:

    NullPointerException - if the item's value is null

    Since:

    1.1

  • addItem public void addItem(String item)

    Obsolete as of Java 2 platform v1.1. Please use the

    add

    method instead.

    Adds an item to this Choice menu.

    Parameters:

    item - the item to be added

    Throws:

    NullPointerException - if the item's value is equal to null

  • insert public void insert(String item, int index)

    Inserts the item into this choice at the specified position. Existing items at an index greater than or equal to

    index

    are shifted up by one to accommodate the new item. If

    index

    is greater than or equal to the number of items in this choice,

    item

    is added to the end of this choice.

    If the item is the first one being added to the choice, then the item becomes selected. Otherwise, if the selected item was one of the items shifted, the first item in the choice becomes the selected item. If the selected item was no among those shifted, it remains the selected item.

    Parameters:

    item - the non-null item to be inserted

    index - the position at which the item should be inserted

    Throws:

    IllegalArgumentException - if index is less than 0

  • remove public void remove(String item)

    Removes the first occurrence of item from the Choice menu. If the item being removed is the currently selected item, then the first item in the choice becomes the selected item. Otherwise, the currently selected item remains selected (and the selected index is updated accordingly).

    Parameters:

    item - the item to remove from this Choice menu

    Throws:

    IllegalArgumentException - if the item doesn't exist in the choice menu

    Since:

    1.1

  • remove

    public void remove(int position)

    Removes an item from the choice menu at the specified position. If the item being removed is the currently selected item, then the first item in the choice becomes the selected item. Otherwise, the currently selected item remains selected (and the selected index is updated accordingly).

    Parameters:

    position - the position of the item

    Throws:

    IndexOutOfBoundsException - if the specified position is out of bounds

    Since:

    1.1

  • removeAll

    public void removeAll()

    Removes all items from the choice menu.

    Since:

    1.1

    See Also:

    • remove(java.lang.String)

  • getSelectedItem public String getSelectedItem

    ()

    Gets a representation of the current choice as a string.

    Returns:

    a string representation of the currently selected item in this choice menu

    See Also:

    • getSelectedIndex()

  • getSelectedObjects public Object[] getSelectedObjects

    ()

    Returns an array (length 1) containing the currently selected item. If this choice has no items, returns null.

    Specified by:

    getSelectedObjects in interface ItemSelectable

    Returns:

    the list of selected objects, or null

    See Also:

    • ItemSelectable

  • getSelectedIndex

    public int getSelectedIndex()

    Returns the index of the currently selected item. If nothing is selected, returns -1.

    Returns:

    the index of the currently selected item, or -1 if nothing is currently selected

    See Also:

    • getSelectedItem()

  • select

    public void select(int pos)

    Sets the selected item in this

    Choice

    menu to be the item at the specified position.

    Note that this method should be primarily used to initially select an item in this component. Programmatically calling this method will not trigger an ItemEvent. The only way to trigger an ItemEvent is by user interaction.

    Parameters:

    pos - the position of the selected item

    Throws:

    IllegalArgumentException - if the specified position is greater than the number of items or less than zero

    See Also:

    • getSelectedItem()
    • getSelectedIndex()

  • select public void select(String str)

    Sets the selected item in this

    Choice

    menu to be the item whose name is equal to the specified string. If more than one item matches (is equal to) the specified string, the one with the smallest index is selected.

    Note that this method should be primarily used to initially select an item in this component. Programmatically calling this method will not trigger an ItemEvent. The only way to trigger an ItemEvent is by user interaction.

    Parameters:

    str - the specified string

    See Also:

    • getSelectedItem()
    • getSelectedIndex()

  • addItemListener

    Adds the specified item listener to receive item events from this

    Choice

    menu. Item events are sent in response to user input, but not in response to calls to

    select

    . If l is

    null

    , no exception is thrown and no action is performed.

    Refer to AWT Threading Issues for details on AWT's threading model.

    Specified by:

    addItemListener in interface ItemSelectable

    Parameters:

    l - the item listener

    Since:

    1.1

    See Also:

    • removeItemListener(java.awt.event.ItemListener)
    • getItemListeners()
    • select(int)
    • ItemEvent
    • ItemListener

  • removeItemListener

    Removes the specified item listener so that it no longer receives item events from this

    Choice

    menu. If l is

    null

    , no exception is thrown and no action is performed.

    Refer to AWT Threading Issues for details on AWT's threading model.

    Specified by:

    removeItemListener in interface ItemSelectable

    Parameters:

    l - the item listener

    Since:

    1.1

    See Also:

    • addItemListener(java.awt.event.ItemListener)
    • getItemListeners()
    • ItemEvent
    • ItemListener

  • getItemListeners

    Returns an array of all the item listeners registered on this choice.

    Returns:

    all of this choice's ItemListeners or an empty array if no item listeners are currently registered

    Since:

    1.4

    See Also:

    • addItemListener(java.awt.event.ItemListener)
    • removeItemListener(java.awt.event.ItemListener)
    • ItemEvent
    • ItemListener

  • getListeners

    Returns an array of all the objects currently registered as

    FooListener

    s upon this

    Choice

    .

    FooListener

    s are registered using the

    addFooListener

    method.

    You can specify the listenerType argument with a class literal, such as FooListener.class. For example, you can query a Choice c for its item listeners with the following code:

    ItemListener[] ils = (ItemListener[])(c.getListeners(ItemListener.class));

    If no such listeners exist, this method returns an empty array.

    Overrides:

    getListeners in class Component

    Type Parameters:

    T - the type of the listeners

    Parameters:

    listenerType - the type of listeners requested; this parameter should specify an interface that descends from java.util.EventListener

    Returns:

    an array of all objects registered as FooListeners on this choice, or an empty array if no such listeners have been added

    Throws:

    ClassCastException - if listenerType doesn't specify a class or interface that implements java.util.EventListener

    Since:

    1.3

    See Also:

    • getItemListeners()

  • processEvent

    Processes events on this choice. If the event is an instance of

    ItemEvent

    , it invokes the

    processItemEvent

    method. Otherwise, it calls its superclass's

    processEvent

    method.

    Note that if the event parameter is null the behavior is unspecified and may result in an exception.

    Overrides:

    processEvent in class Component

    Parameters:

    e - the event

    Since:

    1.1

    See Also:

    • ItemEvent
    • processItemEvent(java.awt.event.ItemEvent)

  • processItemEvent

    Processes item events occurring on this

    Choice

    menu by dispatching them to any registered

    ItemListener

    objects.

    This method is not called unless item events are enabled for this component. Item events are enabled when one of the following occurs:

    • An ItemListener object is registered via addItemListener.
    • Item events are enabled via enableEvents.

    Note that if the event parameter is null the behavior is unspecified and may result in an exception.

    Parameters:

    e - the item event

    Since:

    1.1

    See Also:

    • ItemEvent
    • ItemListener
    • addItemListener(ItemListener)
    • Component.enableEvents(long)

  • paramString protected String paramString

    ()

    Returns a string representing the state of this Choice menu. 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 Component

    Returns:

    the parameter string of this Choice menu

  • getAccessibleContext

    Gets the AccessibleContext associated with this Choice. For Choice components, the AccessibleContext takes the form of an AccessibleAWTChoice. A new AccessibleAWTChoice instance is created if necessary.

    Specified by:

    getAccessibleContext in interface Accessible

    Overrides:

    getAccessibleContext in class Component

    Returns:

    an AccessibleAWTChoice that serves as the AccessibleContext of this Choice

    Since:

    1.3

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