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## javax.swing
Class DefaultListModel

    java.lang.Object
      |
      +--javax.swing.AbstractListModel
            |
            +--javax.swing.DefaultListModel

All Implemented Interfaces:
  ListModel, Serializable

public class DefaultListModel
extends AbstractListModel

This class loosely implements the `java.util.Vector` API, in that it implements the 1.1.x version of `java.util.Vector`, has no collection class support, and notifies the `ListDataListener`s when changes occur. Presently it delegates to a `Vector`, in a future release it will be a real Collection implementation.

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 JavaBeansTM has been added to the `java.beans` package. Please see `XMLEncoder`.

Field Summary

Fields inherited from class javax.swing.AbstractListModel
`listenerList`

Constructor Summary
`DefaultListModel()`

Method Summary
`void` | `add(int index, Object element)` Inserts the specified element at the specified position in this list.
`void` | `addElement(Object obj)` Adds the specified component to the end of this list.
`int` | `capacity()` Returns the current capacity of this list.
`void` | `clear()` Removes all of the elements from this list.
`boolean` | `contains(Object elem)` Tests whether the specified object is a component in this list.
`void` | `copyInto(Object[] anArray)` Copies the components of this list into the specified array.
`Object` | `elementAt(int index)` Returns the component at the specified index.
`Enumeration` | `elements()` Returns an enumeration of the components of this list.
`void` | `ensureCapacity(int minCapacity)` Increases the capacity of this list, if necessary, to ensure that it can hold at least the number of components specified by the minimum capacity argument.
`Object` | `firstElement()` Returns the first component of this list.
`Object` | `get(int index)` Returns the element at the specified position in this list.
`Object` | `getElementAt(int index)` Returns the component at the specified index.
`int` | `getSize()` Returns the number of components in this list.
`int` | `indexOf(Object elem)` Searches for the first occurrence of `elem`.
`int` | `indexOf(Object elem, int index)` Searches for the first occurrence of `elem`, beginning the search at `index`.
`void` | `insertElementAt(Object obj, int index)` Inserts the specified object as a component in this list at the specified `index`.
`boolean` | `isEmpty()` Tests whether this list has any components.
`Object` | `lastElement()` Returns the last component of the list.
`int` | `lastIndexOf(Object elem)` Returns the index of the last occurrence of `elem`.
`int` | `lastIndexOf(Object elem, int index)` Searches backwards for `elem`, starting from the specified index, and returns an index to it.
`Object` | `remove(int index)` Removes the element at the specified position in this list.
`void` | `removeAllElements()` Removes all components from this list and sets its size to zero.
`boolean` | `removeElement(Object obj)` Removes the first (lowest-indexed) occurrence of the argument from this list.
`void` | `removeElementAt(int index)` Deletes the component at the specified index.
`void` | `removeRange(int fromIndex, int toIndex)` Deletes the components at the specified range of indexes.
`Object` | `set(int index, Object element)` Replaces the element at the specified position in this list with the specified element.
`void` | `setElementAt(Object obj, int index)` Sets the component at the specified `index` of this list to be the specified object.
`void` | `setSize(int newSize)` Sets the size of this list.
`int` | `size()` Returns the number of components in this list.
`Object[]` | `toArray()` Returns an array containing all of the elements in this list in the correct order.
`String` | `toString()` Returns a string that displays and identifies this object's properties.
`void` | `trimToSize()` Trims the capacity of this list to be the list's current size.

Methods inherited from class javax.swing.AbstractListModel
`addListDataListener, fireContentsChanged, fireIntervalAdded, fireIntervalRemoved, getListDataListeners, getListeners, removeListDataListener`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### DefaultListModel

    public DefaultListModel()

Method Detail

### getSize

    public int getSize()

  Returns the number of components in this list.

  This method is identical to `size`, which implements the `List` interface defined in the 1.2 Collections framework. This method exists in conjunction with `setSize` so that `size` is identifiable as a JavaBean property.

  Returns:
    the number of components in this list
  See Also:
    `size()`

### getElementAt

    public Object getElementAt(int index)

  Returns the component at the specified index.

  > Note: Although this method is not deprecated, the preferred method to use is `get(int)`, which implements the `List` interface defined in the 1.2 Collections framework.

  Parameters:
    `index` - an index into this list
  Returns:
    the component at the specified index
  Throws:
    `ArrayIndexOutOfBoundsException` - if the `index` is negative or greater than the current size of this list
  See Also:
    `get(int)`

### copyInto

    public void copyInto(Object[] anArray)

  Copies the components of this list into the specified array. The array must be big enough to hold all the objects in this list, else an `IndexOutOfBoundsException` is thrown.

  Parameters:
    `anArray` - the array into which the components get copied
  See Also:
    `Vector.copyInto(Object[])`

### trimToSize

    public void trimToSize()

  Trims the capacity of this list to be the list's current size.

  See Also:
    `Vector.trimToSize()`

### ensureCapacity

    public void ensureCapacity(int minCapacity)

  Increases the capacity of this list, if necessary, to ensure that it can hold at least the number of components specified by the minimum capacity argument.

  Parameters:
    `minCapacity` - the desired minimum capacity
  See Also:
    `Vector.ensureCapacity(int)`

### setSize

    public void setSize(int newSize)

  Sets the size of this list.

  Parameters:
    `newSize` - the new size of this list
  See Also:
    `Vector.setSize(int)`

### capacity

    public int capacity()

  Returns the current capacity of this list.

  Returns:
    the current capacity
  See Also:
    `Vector.capacity()`

### size

    public int size()

  Returns the number of components in this list.

  Returns:
    the number of components in this list
  See Also:
    `Vector.size()`

### isEmpty

    public boolean isEmpty()

  Tests whether this list has any components.

  Returns:
    `true` if and only if this list has no components, that is, its size is zero; `false` otherwise
  See Also:
    `Vector.isEmpty()`

### elements

    public Enumeration elements()

  Returns an enumeration of the components of this list.

  Returns:
    an enumeration of the components of this list
  See Also:
    `Vector.elements()`

### contains

    public boolean contains(Object elem)

  Tests whether the specified object is a component in this list.

  Parameters:
    `elem` - an object
  Returns:
    `true` if the specified object is the same as a component in this list
  See Also:
    `Vector.contains(Object)`

### indexOf

    public int indexOf(Object elem)

  Searches for the first occurrence of `elem`.

  Parameters:
    `elem` - an object
  Returns:
    the index of the first occurrence of the argument in this list; returns `-1` if the object is not found
  See Also:
    `Vector.indexOf(Object)`

### indexOf

    public int indexOf(Object elem,
                       int index)

  Searches for the first occurrence of `elem`, beginning the search at `index`.

  Parameters:
    `elem` - an desired component
    `index` - the index from which to begin searching
  Returns:
    the index where the first occurrence of `elem` is found after `index`; returns `-1` if the `elem` is not found in the list
  See Also:
    `Vector.indexOf(Object,int)`

### lastIndexOf

    public int lastIndexOf(Object elem)

  Returns the index of the last occurrence of `elem`.

  Parameters:
    `elem` - the desired component
  Returns:
    the index of the last occurrence of `elem` in the list; returns `-1` if the object is not found
  See Also:
    `Vector.lastIndexOf(Object)`

### lastIndexOf

    public int lastIndexOf(Object elem,
                           int index)

  Searches backwards for `elem`, starting from the specified index, and returns an index to it.

  Parameters:
    `elem` - the desired component
    `index` - the index to start searching from
  Returns:
    the index of the last occurrence of the `elem` in this list at position less than `index`; returns `-1` if the object is not found
  See Also:
    `Vector.lastIndexOf(Object,int)`

### elementAt

    public Object elementAt(int index)

  Returns the component at the specified index. Throws an `ArrayIndexOutOfBoundsException` if the index is negative or not less than the size of the list.

  > Note: Although this method is not deprecated, the preferred method to use is `get(int)`, which implements the `List` interface defined in the 1.2 Collections framework.

  Parameters:
    `index` - an index into this list
  Returns:
    the component at the specified index
  See Also:
    `get(int)`, `Vector.elementAt(int)`

### firstElement

    public Object firstElement()

  Returns the first component of this list. Throws a `NoSuchElementException` if this vector has no components.

  Returns:
    the first component of this list
  See Also:
    `Vector.firstElement()`

### lastElement

    public Object lastElement()

  Returns the last component of the list. Throws a `NoSuchElementException` if this vector has no components.

  Returns:
    the last component of the list
  See Also:
    `Vector.lastElement()`

### setElementAt

    public void setElementAt(Object obj,
                             int index)

  Sets the component at the specified `index` of this list to be the specified object. The previous component at that position is discarded.

  Throws an `ArrayIndexOutOfBoundsException` if the index is invalid.

  > Note: Although this method is not deprecated, the preferred method to use is `set(int,Object)`, which implements the `List` interface defined in the 1.2 Collections framework.

  Parameters:
    `obj` - what the component is to be set to
    `index` - the specified index
  See Also:
    `set(int,Object)`, `Vector.setElementAt(Object,int)`

### removeElementAt

    public void removeElementAt(int index)

  Deletes the component at the specified index.

  Throws an `ArrayIndexOutOfBoundsException` if the index is invalid.

  > Note: Although this method is not deprecated, the preferred method to use is `remove(int)`, which implements the `List` interface defined in the 1.2 Collections framework.

  Parameters:
    `index` - the index of the object to remove
  See Also:
    `remove(int)`, `Vector.removeElementAt(int)`

### insertElementAt

    public void insertElementAt(Object obj,
                                int index)

  Inserts the specified object as a component in this list at the specified `index`.

  Throws an `ArrayIndexOutOfBoundsException` if the index is invalid.

  > Note: Although this method is not deprecated, the preferred method to use is `add(int,Object)`, which implements the `List` interface defined in the 1.2 Collections framework.

  Parameters:
    `obj` - the component to insert
    `index` - where to insert the new component
  Throws:
    `ArrayIndexOutOfBoundsException` - if the index was invalid
  See Also:
    `add(int,Object)`, `Vector.insertElementAt(Object,int)`

### addElement

    public void addElement(Object obj)

  Adds the specified component to the end of this list.

  Parameters:
    `obj` - the component to be added
  See Also:
    `Vector.addElement(Object)`

### removeElement

    public boolean removeElement(Object obj)

  Removes the first (lowest-indexed) occurrence of the argument from this list.

  Parameters:
    `obj` - the component to be removed
  Returns:
    `true` if the argument was a component of this list; `false` otherwise
  See Also:
    `Vector.removeElement(Object)`

### removeAllElements

    public void removeAllElements()

  Removes all components from this list and sets its size to zero.

  > Note: Although this method is not deprecated, the preferred method to use is `clear`, which implements the `List` interface defined in the 1.2 Collections framework.

  See Also:
    `clear()`, `Vector.removeAllElements()`

### toString

    public String toString()

  Returns a string that displays and identifies this object's properties.

  Overrides:
    `toString` in class `Object`
  Returns:
    a String representation of this object

### toArray

    public Object[] toArray()

  Returns an array containing all of the elements in this list in the correct order.

  Returns:
    an array containing the elements of the list
  See Also:
    `Vector.toArray()`

### get

    public Object get(int index)

  Returns the element at the specified position in this list.

  Throws an `ArrayIndexOutOfBoundsException` if the index is out of range (`index < 0 || index >= size()`).

  Parameters:
    `index` - index of element to return

### set

    public Object set(int index,
                      Object element)

  Replaces the element at the specified position in this list with the specified element.

  Throws an `ArrayIndexOutOfBoundsException` if the index is out of range (`index < 0 || index >= size()`).

  Parameters:
    `index` - index of element to replace
    `element` - element to be stored at the specified position
  Returns:
    the element previously at the specified position

### add

    public void add(int index,
                    Object element)

  Inserts the specified element at the specified position in this list.

  Throws an `ArrayIndexOutOfBoundsException` if the index is out of range (`index < 0 || index > size()`).

  Parameters:
    `index` - index at which the specified element is to be inserted
    `element` - element to be inserted

### remove

    public Object remove(int index)

  Removes the element at the specified position in this list. Returns the element that was removed from the list.

  Throws an `ArrayIndexOutOfBoundsException` if the index is out of range (`index < 0 || index >= size()`).

  Parameters:
    `index` - the index of the element to removed

### clear

    public void clear()

  Removes all of the elements from this list. The list will be empty after this call returns (unless it throws an exception).

### removeRange

    public void removeRange(int fromIndex,
                            int toIndex)

  Deletes the components at the specified range of indexes. The removal is inclusive, so specifying a range of (1,5) removes the component at index 1 and the component at index 5, as well as all components in between.

  Throws an `ArrayIndexOutOfBoundsException` if the index was invalid. Throws an `IllegalArgumentException` if `fromIndex > toIndex`.

  Parameters:
    `fromIndex` - the index of the lower end of the range
    `toIndex` - the index of the upper end of the range
  See Also:
    `remove(int)`

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