IT. Expert System.

Java Standard Edition (SE)

DefaultListModel


javax.swing

Class 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.

    • Constructor Summary

      Constructors 
      Constructor and Description
      DefaultListModel() 
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method and Description
      void add(int index, E element)
      Inserts the specified element at the specified position in this 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.
    • 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 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 - 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 E 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 E 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 E 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(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.

        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:
        element - 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(E element,
                                    int index)
        Inserts the specified element 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:
        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.

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

        Parameters:
        index - index of element to return
      • set

        public E set(int index,
                     E 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,
                        E 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 E 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
        Returns:
        the element previously at the specified position
      • 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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