Module java.desktop

Package javax.swing

Class DefaultListModel<E>

java.lang.Object

javax.swing.AbstractListModel<E>

javax.swing.DefaultListModel<E>

Type Parameters:

E - the type of the elements of this model

All Implemented Interfaces:

Serializable, ListModel<E>

public class DefaultListModel<E>
extends AbstractListModel<E>

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 ListDataListeners 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 JavaBeans has been added to the java.beans package. Please see XMLEncoder.

Since:

1.2

Field Summary

Fields declared in class javax.swing.AbstractListModel

listenerList

Constructor Summary

Constructors

Constructor	Description
DefaultListModel()	Constructs a DefaultListModel.

Method Summary

Modifier and Type	Method	Description
void	add(int index, E element)	Inserts the specified element at the specified position in this list.
void	addAll(int index, Collection<? extends E> c)	Adds all of the elements present in the collection, starting from the specified index.
void	addAll(Collection<? extends E> c)	Adds all of the elements present in the collection to the list.
void	addElement(E element)	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.
E	elementAt(int index)	Returns the component at the specified index.
Enumeration<E>	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.
E	firstElement()	Returns the first component of this list.
E	get(int index)	Returns the element at the specified position in this list.
E	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(E element, int index)	Inserts the specified element as a component in this list at the specified index.
boolean	isEmpty()	Tests whether this list has any components.
E	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.
E	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.
E	set(int index, E element)	Replaces the element at the specified position in this list with the specified element.
void	setElementAt(E element, int index)	Sets the component at the specified index of this list to be the specified element.
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 declared in class javax.swing.AbstractListModel

addListDataListener, fireContentsChanged, fireIntervalAdded, fireIntervalRemoved, getListDataListeners, getListeners, removeListDataListener

Methods declared in class java.lang.Object

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

Constructor Details

DefaultListModel

public DefaultListModel()

Constructs a DefaultListModel.

Method Details

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 E 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<E> 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 - the 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 elem 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 E elementAt(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 not less than the size of the list

See Also:

• get(int)
• Vector.elementAt(int)

firstElement

public E firstElement()

Returns the first component of this list.

Returns:

the first component of this list

Throws:

NoSuchElementException - if this vector has no components

See Also:

• Vector.firstElement()

lastElement

public E lastElement()

Returns the last component of the list.

Returns:

the last component of the list

Throws:

NoSuchElementException - if this vector has no components

See Also:

• Vector.lastElement()

setElementAt

public void setElementAt(E element,
 int index)

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

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:

element - what the component is to be set to

index - the specified index

Throws:

ArrayIndexOutOfBoundsException - if the index is invalid

See Also:

• set(int,Object)
• Vector.setElementAt(Object,int)

removeElementAt

public void removeElementAt(int index)

Deletes the component at the specified index.

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

Throws:

ArrayIndexOutOfBoundsException - if the index is invalid

See Also:

• remove(int)
• Vector.removeElementAt(int)

insertElementAt

public void insertElementAt(E element,
 int index)

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

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:

element - 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(E element)

Adds the specified component to the end of this list.

Parameters:

element - 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 E get(int index)

Returns the element at the specified position in this list.

Parameters:

index - index of element to return

Returns:

the element at the specified position in this list

Throws:

ArrayIndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size())

set

public E set(int index,
 E element)

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

Parameters:

index - index of element to replace

element - element to be stored at the specified position

Returns:

the element previously at the specified position

Throws:

ArrayIndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size())

add

public void add(int index,
 E element)

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

Parameters:

index - index at which the specified element is to be inserted

element - element to be inserted

Throws:

ArrayIndexOutOfBoundsException - if the index is out of range (index < 0 || index > size())

remove

public E remove(int index)

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

Parameters:

index - the index of the element to removed

Returns:

the element previously at the specified position

Throws:

ArrayIndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size())

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.

Parameters:

fromIndex - the index of the lower end of the range

toIndex - the index of the upper end of the range

Throws:

ArrayIndexOutOfBoundsException - if the index was invalid

IllegalArgumentException - if fromIndex > toIndex

See Also:

• remove(int)

addAll

public void addAll(Collection<? extends E> c)

Adds all of the elements present in the collection to the list.

Parameters:

c - the collection which contains the elements to add

Throws:

NullPointerException - if c is null

addAll

public void addAll(int index,
 Collection<? extends E> c)

Adds all of the elements present in the collection, starting from the specified index.

Parameters:

index - index at which to insert the first element from the specified collection

c - the collection which contains the elements to add

Throws:

ArrayIndexOutOfBoundsException - if index does not fall within the range of number of elements currently held

NullPointerException - if c is null