java.awt

## Class List

- java.lang.Object
- - java.awt.Component
  - - java.awt.List

- All Implemented Interfaces:
    ImageObserver, ItemSelectable, MenuContainer, Serializable, Accessible

      public class List
      extends Component
      implements ItemSelectable, Accessible

  The `List` component presents the user with a scrolling list of text items. The list can be set up so that the user can choose either one item or multiple items.

  For example, the code . . .

  >      List lst = new List(4, false);
  >      lst.add("Mercury");
  >      lst.add("Venus");
  >      lst.add("Earth");
  >      lst.add("JavaSoft");
  >      lst.add("Mars");
  >      lst.add("Jupiter");
  >      lst.add("Saturn");
  >      lst.add("Uranus");
  >      lst.add("Neptune");
  >      lst.add("Pluto");
  >      cnt.add(lst);

  where `cnt` is a container, produces the following scrolling list:

  If the List allows multiple selections, then clicking on an item that is already selected deselects it. In the preceding example, only one item from the scrolling list can be selected at a time, since the second argument when creating the new scrolling list is `false`. If the List does not allow multiple selections, selecting an item causes any other selected item to be deselected.

  Note that the list in the example shown was created with four visible rows. Once the list has been created, the number of visible rows cannot be changed. A default `List` is created with four rows, so that `lst = new List()` is equivalent to `list = new List(4, false)`.

  Beginning with Java 1.1, the Abstract Window Toolkit sends the `List` object all mouse, keyboard, and focus events that occur over it. (The old AWT event model is being maintained only for backwards compatibility, and its use is discouraged.)

  When an item is selected or deselected by the user, AWT sends an instance of `ItemEvent` to the list. When the user double-clicks on an item in a scrolling list, AWT sends an instance of `ActionEvent` to the list following the item event. AWT also generates an action event when the user presses the return key while an item in the list is selected.

  If an application wants to perform some action based on an item in this list being selected or activated by the user, it should implement `ItemListener` or `ActionListener` as appropriate and register the new listener to receive events from this list.

  For multiple-selection scrolling lists, it is considered a better user interface to use an external gesture (such as clicking on a button) to trigger the action.

  Since:
    JDK1.0
  See Also:
    `ItemEvent`, `ItemListener`, `ActionEvent`, `ActionListener`, Serialized Form

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `protected class` | `List.AccessibleAWTList` This class implements accessibility support for the `List` class.

    - ### Nested classes/interfaces inherited from class java.awt.Component

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

  - ### Field Summary

    - ### 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

    Constructors
    Constructor and Description
    `List()` Creates a new scrolling list.
    `List(int rows)` Creates a new scrolling list initialized with the specified number of visible lines.
    `List(int rows, boolean multipleMode)` Creates a new scrolling list initialized to display the specified number of rows.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `add(String item)` Adds the specified item to the end of scrolling list.
    `void` | `add(String item, int index)` Adds the specified item to the the scrolling list at the position indicated by the index.
    `void` | `addActionListener(ActionListener l)` Adds the specified action listener to receive action events from this list.
    `void` | `addItem(String item)` Deprecated. replaced by `add(String)`.
    `void` | `addItem(String item, int index)` Deprecated. replaced by `add(String, int)`.
    `void` | `addItemListener(ItemListener l)` Adds the specified item listener to receive item events from this list.
    `void` | `addNotify()` Creates the peer for the list.
    `boolean` | `allowsMultipleSelections()` Deprecated. As of JDK version 1.1, replaced by `isMultipleMode()`.
    `void` | `clear()` Deprecated. As of JDK version 1.1, replaced by `removeAll()`.
    `int` | `countItems()` Deprecated. As of JDK version 1.1, replaced by `getItemCount()`.
    `void` | `delItem(int position)` Deprecated. replaced by `remove(String)` and `remove(int)`.
    `void` | `delItems(int start, int end)` Deprecated. As of JDK version 1.1, Not for public use in the future. This method is expected to be retained only as a package private method.
    `void` | `deselect(int index)` Deselects the item at the specified index.
    `AccessibleContext` | `getAccessibleContext()` Gets the `AccessibleContext` associated with this `List`.
    `ActionListener[]` | `getActionListeners()` Returns an array of all the action listeners registered on this list.
    `String` | `getItem(int index)` Gets the item associated with the specified index.
    `int` | `getItemCount()` Gets the number of items in the list.
    `ItemListener[]` | `getItemListeners()` Returns an array of all the item listeners registered on this list.
    `String[]` | `getItems()` Gets the items in the list.
    `<T extends EventListener> T[]` | `getListeners(Class<T> listenerType)` Returns an array of all the objects currently registered as `FooListener`s upon this `List`.
    `Dimension` | `getMinimumSize()` Determines the minimum size of this scrolling list.
    `Dimension` | `getMinimumSize(int rows)` Gets the minimum dimensions for a list with the specified number of rows.
    `Dimension` | `getPreferredSize()` Gets the preferred size of this scrolling list.
    `Dimension` | `getPreferredSize(int rows)` Gets the preferred dimensions for a list with the specified number of rows.
    `int` | `getRows()` Gets the number of visible lines in this list.
    `int` | `getSelectedIndex()` Gets the index of the selected item on the list,
    `int[]` | `getSelectedIndexes()` Gets the selected indexes on the list.
    `String` | `getSelectedItem()` Gets the selected item on this scrolling list.
    `String[]` | `getSelectedItems()` Gets the selected items on this scrolling list.
    `Object[]` | `getSelectedObjects()` Gets the selected items on this scrolling list in an array of Objects.
    `int` | `getVisibleIndex()` Gets the index of the item that was last made visible by the method `makeVisible`.
    `boolean` | `isIndexSelected(int index)` Determines if the specified item in this scrolling list is selected.
    `boolean` | `isMultipleMode()` Determines whether this list allows multiple selections.
    `boolean` | `isSelected(int index)` Deprecated. As of JDK version 1.1, replaced by `isIndexSelected(int)`.
    `void` | `makeVisible(int index)` Makes the item at the specified index visible.
    `Dimension` | `minimumSize()` Deprecated. As of JDK version 1.1, replaced by `getMinimumSize()`.
    `Dimension` | `minimumSize(int rows)` Deprecated. As of JDK version 1.1, replaced by `getMinimumSize(int)`.
    `protected String` | `paramString()` Returns the parameter string representing the state of this scrolling list.
    `Dimension` | `preferredSize()` Deprecated. As of JDK version 1.1, replaced by `getPreferredSize()`.
    `Dimension` | `preferredSize(int rows)` Deprecated. As of JDK version 1.1, replaced by `getPreferredSize(int)`.
    `protected void` | `processActionEvent(ActionEvent e)` Processes action events occurring on this component by dispatching them to any registered `ActionListener` objects.
    `protected void` | `processEvent(AWTEvent e)` Processes events on this scrolling list.
    `protected void` | `processItemEvent(ItemEvent e)` Processes item events occurring on this list by dispatching them to any registered `ItemListener` objects.
    `void` | `remove(int position)` Removes the item at the specified position from this scrolling list.
    `void` | `remove(String item)` Removes the first occurrence of an item from the list.
    `void` | `removeActionListener(ActionListener l)` Removes the specified action listener so that it no longer receives action events from this list.
    `void` | `removeAll()` Removes all items from this list.
    `void` | `removeItemListener(ItemListener l)` Removes the specified item listener so that it no longer receives item events from this list.
    `void` | `removeNotify()` Removes the peer for this list.
    `void` | `replaceItem(String newValue, int index)` Replaces the item at the specified index in the scrolling list with the new string.
    `void` | `select(int index)` Selects the item at the specified index in the scrolling list.
    `void` | `setMultipleMode(boolean b)` Sets the flag that determines whether this list allows multiple selections.
    `void` | `setMultipleSelections(boolean b)` Deprecated. As of JDK version 1.1, replaced by `setMultipleMode(boolean)`.

    - ### 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, 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, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, 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, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paint, paintAll, postEvent, prepareImage, prepareImage, print, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, revalidate, 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`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### List

          public List()
               throws HeadlessException

      Creates a new scrolling list. By default, there are four visible lines and multiple selections are not allowed. Note that this is a convenience method for `List(0, false)`. Also note that the number of visible lines in the list cannot be changed after it has been created.
      Throws:
        `HeadlessException` - if GraphicsEnvironment.isHeadless() returns true.
      See Also:
        `GraphicsEnvironment.isHeadless()`

    - #### List

          public List(int rows)
               throws HeadlessException

      Creates a new scrolling list initialized with the specified number of visible lines. By default, multiple selections are not allowed. Note that this is a convenience method for `List(rows, false)`. Also note that the number of visible rows in the list cannot be changed after it has been created.
      Parameters:
        `rows` - the number of items to show.
      Throws:
        `HeadlessException` - if GraphicsEnvironment.isHeadless() returns true.
      Since:
        JDK1.1
      See Also:
        `GraphicsEnvironment.isHeadless()`

    - #### List

          public List(int rows,
              boolean multipleMode)
               throws HeadlessException

      Creates a new scrolling list initialized to display the specified number of rows. Note that if zero rows are specified, then the list will be created with a default of four rows. Also note that the number of visible rows in the list cannot be changed after it has been created. If the value of `multipleMode` is `true`, then the user can select multiple items from the list. If it is `false`, only one item at a time can be selected.
      Parameters:
        `rows` - the number of items to show.
        `multipleMode` - if `true`, then multiple selections are allowed; otherwise, only one item can be selected at a time.
      Throws:
        `HeadlessException` - if GraphicsEnvironment.isHeadless() returns true.
      See Also:
        `GraphicsEnvironment.isHeadless()`

  - ### Method Detail

    - #### addNotify

          public void addNotify()

      Creates the peer for the list. The peer allows us to modify the list's appearance without changing its functionality.
      Overrides:
        `addNotify` in class `Component`
      See Also:
        `Component.isDisplayable()`, `Component.removeNotify()`, `Component.invalidate()`

    - #### removeNotify

          public void removeNotify()

      Removes the peer for this list. The peer allows us to modify the list's appearance without changing its functionality.
      Overrides:
        `removeNotify` in class `Component`
      See Also:
        `Component.isDisplayable()`, `Component.addNotify()`

    - #### getItemCount

          public int getItemCount()

      Gets the number of items in the list.
      Returns:
        the number of items in the list
      Since:
        JDK1.1
      See Also:
        `getItem(int)`

    - #### countItems

          @Deprecated
          public int countItems()

      Deprecated. As of JDK version 1.1, replaced by `getItemCount()`.

    - #### getItem

          public String getItem(int index)

      Gets the item associated with the specified index.
      Parameters:
        `index` - the position of the item
      Returns:
        an item that is associated with the specified index
      See Also:
        `getItemCount()`

    - #### getItems

          public String[] getItems()

      Gets the items in the list.
      Returns:
        a string array containing items of the list
      Since:
        JDK1.1
      See Also:
        `select(int)`, `deselect(int)`, `isIndexSelected(int)`

    - #### add

          public void add(String item)

      Adds the specified item to the end of scrolling list.
      Parameters:
        `item` - the item to be added
      Since:
        JDK1.1

    - #### addItem

          @Deprecated
          public void addItem(String item)

      Deprecated. replaced by `add(String)`.

    - #### add

          public void add(String item,
                 int index)

      Adds the specified item to the the scrolling list at the position indicated by the index. The index is zero-based. If the value of the index is less than zero, or if the value of the index is greater than or equal to the number of items in the list, then the item is added to the end of the list.
      Parameters:
        `item` - the item to be added; if this parameter is `null` then the item is treated as an empty string, `""`
        `index` - the position at which to add the item
      Since:
        JDK1.1

    - #### addItem

          @Deprecated
          public void addItem(String item,
                                int index)

      Deprecated. replaced by `add(String, int)`.

    - #### replaceItem

          public void replaceItem(String newValue,
                         int index)

      Replaces the item at the specified index in the scrolling list with the new string.
      Parameters:
        `newValue` - a new string to replace an existing item
        `index` - the position of the item to replace
      Throws:
        `ArrayIndexOutOfBoundsException` - if `index` is out of range

    - #### removeAll

          public void removeAll()

      Removes all items from this list.
      Since:
        JDK1.1
      See Also:
        `remove(java.lang.String)`, `delItems(int, int)`

    - #### clear

          @Deprecated
          public void clear()

      Deprecated. As of JDK version 1.1, replaced by `removeAll()`.

    - #### remove

          public void remove(String item)

      Removes the first occurrence of an item from the list. If the specified item is selected, and is the only selected item in the list, the list is set to have no selection.
      Parameters:
        `item` - the item to remove from the list
      Throws:
        `IllegalArgumentException` - if the item doesn't exist in the list
      Since:
        JDK1.1

    - #### remove

          public void remove(int position)

      Removes the item at the specified position from this scrolling list. If the item with the specified position is selected, and is the only selected item in the list, the list is set to have no selection.
      Parameters:
        `position` - the index of the item to delete
      Throws:
        `ArrayIndexOutOfBoundsException` - if the `position` is less than 0 or greater than `getItemCount()-1`
      Since:
        JDK1.1
      See Also:
        `add(String, int)`

    - #### delItem

          @Deprecated
          public void delItem(int position)

      Deprecated. replaced by `remove(String)` and `remove(int)`.

    - #### getSelectedIndex

          public int getSelectedIndex()

      Gets the index of the selected item on the list,
      Returns:
        the index of the selected item; if no item is selected, or if multiple items are selected, `-1` is returned.
      See Also:
        `select(int)`, `deselect(int)`, `isIndexSelected(int)`

    - #### getSelectedIndexes

          public int[] getSelectedIndexes()

      Gets the selected indexes on the list.
      Returns:
        an array of the selected indexes on this scrolling list; if no item is selected, a zero-length array is returned.
      See Also:
        `select(int)`, `deselect(int)`, `isIndexSelected(int)`

    - #### getSelectedItem

          public String getSelectedItem()

      Gets the selected item on this scrolling list.
      Returns:
        the selected item on the list; if no item is selected, or if multiple items are selected, `null` is returned.
      See Also:
        `select(int)`, `deselect(int)`, `isIndexSelected(int)`

    - #### getSelectedItems

          public String[] getSelectedItems()

      Gets the selected items on this scrolling list.
      Returns:
        an array of the selected items on this scrolling list; if no item is selected, a zero-length array is returned.
      See Also:
        `select(int)`, `deselect(int)`, `isIndexSelected(int)`

    - #### getSelectedObjects

          public Object[] getSelectedObjects()

      Gets the selected items on this scrolling list in an array of Objects.
      Specified by:
        `getSelectedObjects` in interface `ItemSelectable`
      Returns:
        an array of `Object`s representing the selected items on this scrolling list; if no item is selected, a zero-length array is returned.
      See Also:
        `getSelectedItems()`, `ItemSelectable`

    - #### select

          public void select(int index)

      Selects the item at the specified index in the scrolling list.

      Note that passing out of range parameters is invalid, and will result in unspecified behavior.

      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:
        `index` - the position of the item to select
      See Also:
        `getSelectedItem()`, `deselect(int)`, `isIndexSelected(int)`

    - #### deselect

          public void deselect(int index)

      Deselects the item at the specified index.

      Note that passing out of range parameters is invalid, and will result in unspecified behavior.

      If the item at the specified index is not selected, then the operation is ignored.

      Parameters:
        `index` - the position of the item to deselect
      See Also:
        `select(int)`, `getSelectedItem()`, `isIndexSelected(int)`

    - #### isIndexSelected

          public boolean isIndexSelected(int index)

      Determines if the specified item in this scrolling list is selected.
      Parameters:
        `index` - the item to be checked
      Returns:
        `true` if the specified item has been selected; `false` otherwise
      Since:
        JDK1.1
      See Also:
        `select(int)`, `deselect(int)`

    - #### isSelected

          @Deprecated
          public boolean isSelected(int index)

      Deprecated. As of JDK version 1.1, replaced by `isIndexSelected(int)`.

    - #### getRows

          public int getRows()

      Gets the number of visible lines in this list. Note that once the `List` has been created, this number will never change.
      Returns:
        the number of visible lines in this scrolling list

    - #### isMultipleMode

          public boolean isMultipleMode()

      Determines whether this list allows multiple selections.
      Returns:
        `true` if this list allows multiple selections; otherwise, `false`
      Since:
        JDK1.1
      See Also:
        `setMultipleMode(boolean)`

    - #### allowsMultipleSelections

          @Deprecated
          public boolean allowsMultipleSelections()

      Deprecated. As of JDK version 1.1, replaced by `isMultipleMode()`.

    - #### setMultipleMode

          public void setMultipleMode(boolean b)

      Sets the flag that determines whether this list allows multiple selections. When the selection mode is changed from multiple-selection to single-selection, the selected items change as follows: If a selected item has the location cursor, only that item will remain selected. If no selected item has the location cursor, all items will be deselected.
      Parameters:
        `b` - if `true` then multiple selections are allowed; otherwise, only one item from the list can be selected at once
      Since:
        JDK1.1
      See Also:
        `isMultipleMode()`

    - #### setMultipleSelections

          @Deprecated
          public void setMultipleSelections(boolean b)

      Deprecated. As of JDK version 1.1, replaced by `setMultipleMode(boolean)`.

    - #### getVisibleIndex

          public int getVisibleIndex()

      Gets the index of the item that was last made visible by the method `makeVisible`.
      Returns:
        the index of the item that was last made visible
      See Also:
        `makeVisible(int)`

    - #### makeVisible

          public void makeVisible(int index)

      Makes the item at the specified index visible.
      Parameters:
        `index` - the position of the item
      See Also:
        `getVisibleIndex()`

    - #### getPreferredSize

          public Dimension getPreferredSize(int rows)

      Gets the preferred dimensions for a list with the specified number of rows.
      Parameters:
        `rows` - number of rows in the list
      Returns:
        the preferred dimensions for displaying this scrolling list given that the specified number of rows must be visible
      Since:
        JDK1.1
      See Also:
        `Component.getPreferredSize()`

    - #### preferredSize

          @Deprecated
          public Dimension preferredSize(int rows)

      Deprecated. As of JDK version 1.1, replaced by `getPreferredSize(int)`.

    - #### getPreferredSize

          public Dimension getPreferredSize()

      Gets the preferred size of this scrolling list.
      Overrides:
        `getPreferredSize` in class `Component`
      Returns:
        the preferred dimensions for displaying this scrolling list
      Since:
        JDK1.1
      See Also:
        `Component.getPreferredSize()`

    - #### preferredSize

          @Deprecated
          public Dimension preferredSize()

      Deprecated. As of JDK version 1.1, replaced by `getPreferredSize()`.
      Overrides:
        `preferredSize` in class `Component`

    - #### getMinimumSize

          public Dimension getMinimumSize(int rows)

      Gets the minimum dimensions for a list with the specified number of rows.
      Parameters:
        `rows` - number of rows in the list
      Returns:
        the minimum dimensions for displaying this scrolling list given that the specified number of rows must be visible
      Since:
        JDK1.1
      See Also:
        `Component.getMinimumSize()`

    - #### minimumSize

          @Deprecated
          public Dimension minimumSize(int rows)

      Deprecated. As of JDK version 1.1, replaced by `getMinimumSize(int)`.

    - #### getMinimumSize

          public Dimension getMinimumSize()

      Determines the minimum size of this scrolling list.
      Overrides:
        `getMinimumSize` in class `Component`
      Returns:
        the minimum dimensions needed to display this scrolling list
      Since:
        JDK1.1
      See Also:
        `Component.getMinimumSize()`

    - #### minimumSize

          @Deprecated
          public Dimension minimumSize()

      Deprecated. As of JDK version 1.1, replaced by `getMinimumSize()`.
      Overrides:
        `minimumSize` in class `Component`

    - #### addItemListener

          public void addItemListener(ItemListener l)

      Adds the specified item listener to receive item events from this list. Item events are sent in response to user input, but not in response to calls to `select` or `deselect`. If listener `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:
        JDK1.1
      See Also:
        `removeItemListener(java.awt.event.ItemListener)`, `getItemListeners()`, `select(int)`, `deselect(int)`, `ItemEvent`, `ItemListener`

    - #### removeItemListener

          public void removeItemListener(ItemListener l)

      Removes the specified item listener so that it no longer receives item events from this list. If listener `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:
        JDK1.1
      See Also:
        `addItemListener(java.awt.event.ItemListener)`, `getItemListeners()`, `ItemEvent`, `ItemListener`

    - #### getItemListeners

          public ItemListener[] getItemListeners()

      Returns an array of all the item listeners registered on this list.
      Returns:
        all of this list's `ItemListener`s 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`

    - #### addActionListener

          public void addActionListener(ActionListener l)

      Adds the specified action listener to receive action events from this list. Action events occur when a user double-clicks on a list item or types Enter when the list has the keyboard focus.

      If listener `l` is `null`, no exception is thrown and no action is performed.

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

      Parameters:
        `l` - the action listener
      Since:
        JDK1.1
      See Also:
        `removeActionListener(java.awt.event.ActionListener)`, `getActionListeners()`, `ActionEvent`, `ActionListener`

    - #### removeActionListener

          public void removeActionListener(ActionListener l)

      Removes the specified action listener so that it no longer receives action events from this list. Action events occur when a user double-clicks on a list item. If listener `l` is `null`, no exception is thrown and no action is performed.

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

      Parameters:
        `l` - the action listener
      Since:
        JDK1.1
      See Also:
        `addActionListener(java.awt.event.ActionListener)`, `getActionListeners()`, `ActionEvent`, `ActionListener`

    - #### getActionListeners

          public ActionListener[] getActionListeners()

      Returns an array of all the action listeners registered on this list.
      Returns:
        all of this list's `ActionListener`s or an empty array if no action listeners are currently registered
      Since:
        1.4
      See Also:
        `addActionListener(java.awt.event.ActionListener)`, `removeActionListener(java.awt.event.ActionListener)`, `ActionEvent`, `ActionListener`

    - #### getListeners

          public <T extends EventListener> T[] getListeners(Class<T> listenerType)

      Returns an array of all the objects currently registered as `FooListener`s upon this `List`. `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 `List` `l` for its item listeners with the following code:

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

      If no such listeners exist, this method returns an empty array.
      Overrides:
        `getListeners` in class `Component`
      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 `FooListener`s on this list, 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

          protected void processEvent(AWTEvent e)

      Processes events on this scrolling list. If an event is an instance of `ItemEvent`, it invokes the `processItemEvent` method. Else, if the event is an instance of `ActionEvent`, it invokes `processActionEvent`. If the event is not an item event or an action event, it invokes `processEvent` on the superclass.

      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:
        JDK1.1
      See Also:
        `ActionEvent`, `ItemEvent`, `processActionEvent(java.awt.event.ActionEvent)`, `processItemEvent(java.awt.event.ItemEvent)`

    - #### processItemEvent

          protected void processItemEvent(ItemEvent e)

      Processes item events occurring on this list 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:
        JDK1.1
      See Also:
        `ItemEvent`, `ItemListener`, `addItemListener(java.awt.event.ItemListener)`, `Component.enableEvents(long)`

    - #### processActionEvent

          protected void processActionEvent(ActionEvent e)

      Processes action events occurring on this component by dispatching them to any registered `ActionListener` objects.

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

      - An `ActionListener` object is registered via `addActionListener`.
      - Action 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 action event
      Since:
        JDK1.1
      See Also:
        `ActionEvent`, `ActionListener`, `addActionListener(java.awt.event.ActionListener)`, `Component.enableEvents(long)`

    - #### paramString

          protected String paramString()

      Returns the parameter string representing the state of this scrolling list. This string is useful for debugging.
      Overrides:
        `paramString` in class `Component`
      Returns:
        the parameter string of this scrolling list

    - #### delItems

          @Deprecated
          public void delItems(int start,
                                 int end)

      Deprecated. As of JDK version 1.1, Not for public use in the future. This method is expected to be retained only as a package private method.

    - #### getAccessibleContext

          public AccessibleContext getAccessibleContext()

      Gets the `AccessibleContext` associated with this `List`. For lists, the `AccessibleContext` takes the form of an `AccessibleAWTList`. A new `AccessibleAWTList` instance is created, if necessary.
      Specified by:
        `getAccessibleContext` in interface `Accessible`
      Overrides:
        `getAccessibleContext` in class `Component`
      Returns:
        an `AccessibleAWTList` that serves as the `AccessibleContext` of this `List`
      Since:
        1.3

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