javax.swing
class DefaultListModel

java.lang.Object javax.swing.AbstractListModel javax.swing.DefaultListModel

All Implemented Interfaces:

Serializable, ListModel

Most common way to construct:

DefaultListModel model = new DefaultListModel();

Based on 158 examples

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 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^TM has been added to the java.beans package. Please see {@link java.beans.XMLEncoder}.

DefaultListModel

public DefaultListModel()

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

addElement

public void addElement(Object obj)

Adds the specified component to the end of this list.

Parameters:

obj - the component to be added

capacity

public int capacity()

Returns the current capacity of this list.

Returns:

the current capacity

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).

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

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

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

elements

public Enumeration elements()

Returns an enumeration of the components of this list.

Returns:

an enumeration of the components of this list

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

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

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

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

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

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

setSize

public void setSize(int newSize)

Sets the size of this list.

Parameters:

newSize - the new size of this list

size

public int size()

Returns the number of components in this list.

Returns:

the number of components in this list

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

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

trimToSize

public void trimToSize()

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