java.lang.Object
java.awt.Component
java.awt.Choice
public class Choice
The Choice 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.
Choice()
void add(String item)
Choice menu. void addItem(String item)
void addItemListener(ItemListener l)
Choice menu. void addNotify()
Choice's peer. int countItems()
getItemCount(). AccessibleContext getAccessibleContext()
AccessibleContext associated with this Choice. String getItem(int index)
Choice menu. int getItemCount()
Choice menu. ItemListener[] getItemListeners()
<T extends EventListener>
T[] getListeners(Class<T> listenerType)
FooListeners upon this Choice. int getSelectedIndex()
String getSelectedItem()
Object[] getSelectedObjects()
void insert(String item, int index)
protected String paramString()
Choice menu. protected void processEvent(AWTEvent e)
protected void processItemEvent(ItemEvent e)
Choice menu by dispatching them to any registered ItemListener objects. void remove(int position)
void remove(String item)
item from the Choice menu. void removeAll()
void removeItemListener(ItemListener l)
Choice menu. void select(int pos)
Choice menu to be the item at the specified position. void select(String str)
Choice menu to be the item whose name is equal to the specified string. Methods inherited from class java.awt.Component action, 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, 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, getPeer, 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, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, update, validate Choice
public Choice()
throws HeadlessException
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.
HeadlessException - if GraphicsEnvironment.isHeadless() returns true
GraphicsEnvironment.isHeadless(), select(int), select(java.lang.String)
public void addNotify()
Choice's peer. This peer allows us to change the look of the Choice without changing its functionality.
addNotify in class Component
Toolkit.createChoice(java.awt.Choice), Component.getToolkit()
public int getItemCount()
Choice menu.
Choice menu
getItem(int)
@Deprecated public int countItems()
getItemCount().
public String getItem(int index)
Choice menu.
index - the index at which to begin
getItemCount()
public void add(String item)
Choice menu.
item - the item to be added
NullPointerException - if the item's value is null
public void addItem(String item)
add method instead.
Adds an item to this Choice menu.
item - the item to be added
NullPointerException - if the item's value is equal to null
public void insert(String item,
int index)
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.
item - the non-null item to be inserted
index - the position at which the item should be inserted
IllegalArgumentException - if index is less than 0
public void remove(String item)
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).
item - the item to remove from this Choice menu
IllegalArgumentException - if the item doesn't exist in the choice menu
public void remove(int position)
position - the position of the item
IndexOutOfBoundsException - if the specified position is out of bounds
public void removeAll()
remove(java.lang.String)
public String getSelectedItem()
getSelectedIndex()
public Object[] getSelectedObjects()
null.
getSelectedObjects in interface ItemSelectable
ItemSelectable
public int getSelectedIndex()
getSelectedItem()
public void select(int pos)
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.
pos - the positon of the selected item
IllegalArgumentException - if the specified position is greater than the number of items or less than zero
getSelectedItem(), getSelectedIndex()
public void select(String str)
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.
str - the specified string
getSelectedItem(), getSelectedIndex()
public void addItemListener(ItemListener l)
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.
addItemListener in interface ItemSelectable
l - the item listener
removeItemListener(java.awt.event.ItemListener), getItemListeners(), select(int), ItemEvent, ItemListener
public void removeItemListener(ItemListener l)
Choice menu. If l is null, no exception is thrown and no action is performed.
removeItemListener in interface ItemSelectable
l - the item listener
addItemListener(java.awt.event.ItemListener), getItemListeners(), ItemEvent, ItemListener
public ItemListener[] getItemListeners()
ItemListeners or an empty array if no item listeners are currently registered
addItemListener(java.awt.event.ItemListener), removeItemListener(java.awt.event.ItemListener), ItemEvent, ItemListener
public <T extends EventListener> T[] getListeners(Class<T> listenerType)
FooListeners upon this Choice. FooListeners 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.
getListeners in class Component
listenerType - the type of listeners requested; this parameter should specify an interface that descends from java.util.EventListener
FooListeners on this choice, or an empty array if no such listeners have been added
ClassCastException - if listenerType doesn't specify a class or interface that implements java.util.EventListener
getItemListeners()
protected void processEvent(AWTEvent e)
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.
processEvent in class Component
e - the event
ItemEvent, processItemEvent(java.awt.event.ItemEvent)
protected void processItemEvent(ItemEvent e)
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:
ItemListener object is registered via addItemListener.enableEvents.Note that if the event parameter is null the behavior is unspecified and may result in an exception.
e - the item event
ItemEvent, ItemListener, addItemListener(ItemListener), Component.enableEvents(long)
protected String paramString()
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.
paramString in class Component
Choice menu
public AccessibleContext getAccessibleContext()
AccessibleContext associated with this Choice. For Choice components, the AccessibleContext takes the form of an AccessibleAWTChoice. A new AccessibleAWTChoice instance is created if necessary.
getAccessibleContext in interface Accessible
getAccessibleContext in class Component
AccessibleAWTChoice that serves as the AccessibleContext of this Choice
Copyright © 2004, 2010 Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4