public abstract class

AbstractList

extends AbstractCollection<E>
implements List<E>

java.lang.Object
↳	java.util.AbstractCollection<E>
	↳	java.util.AbstractList<E>

Known Direct Subclasses

AbstractSequentialList<E>, ArrayList<E>, Vector<E>

Known Indirect Subclasses

LinkedList<E>, Stack<E>

Class Overview

AbstractList is an abstract implementation of the List interface, optimized for a backing store which supports random access. This implementation does not support adding or replacing. A subclass must implement the abstract methods get() and size().

Summary

Fields
protected int	modCount

Protected Constructors
	AbstractList() Constructs a new instance of this AbstractList.

Public Methods
void	add(int location, E object) Inserts the specified object into this List at the specified location.
boolean	add(E object) Adds the specified object at the end of this List.
boolean	addAll(int location, Collection<? extends E> collection) Inserts the objects in the specified Collection at the specified location in this List.
void	clear() Removes all elements from this List, leaving it empty.
boolean	equals(Object object) Compares the specified object to this List and answer if they are equal.
abstract E	get(int location) Returns the element at the specified location in this List.
int	hashCode() Returns an integer hash code for the receiver.
int	indexOf(Object object) Searches this List for the specified object and returns the index of the first occurrence.
Iterator<E>	iterator() Returns an Iterator on the elements of this List.
int	lastIndexOf(Object object) Searches this List for the specified object and returns the index of the last occurrence.
ListIterator<E>	listIterator() Returns a ListIterator on the elements of this List.
ListIterator<E>	listIterator(int location) Returns a ListIterator on the elements of this List.
E	remove(int location) Removes the object at the specified location from this List.
E	set(int location, E object) Replaces the element at the specified location in this List with the specified object.
List<E>	subList(int start, int end) Returns a part of consecutive elements of this list as a view.

Protected Methods
void	removeRange(int start, int end) Removes the objects in the specified range from the start to the, but not including, end index.

[Expand]

Inherited Methods

From class java.util.AbstractCollection

boolean	add(E object) If the specified element is not contained within this collection, and addition of this element succeeds, then true will be returned.
boolean	addAll(Collection<? extends E> collection) Adds the objects in the specified Collection to this Collection.
void	clear() Removes all the elements in this collection.
boolean	contains(Object object) Searches this Collection for the specified object.
boolean	containsAll(Collection<?> collection) Searches this Collection for all objects in the specified Collection.
boolean	isEmpty() Returns true if the collection has no element, otherwise false.
abstract Iterator<E>	iterator() Returns an Iterator on the elements of this Collection.
boolean	remove(Object object) Removes the first occurrence of the specified object from this Collection.
boolean	removeAll(Collection<?> collection) Removes all occurrences in this Collection of each object in the specified Collection.
boolean	retainAll(Collection<?> collection) Removes all objects from this Collection that are not contained in the specified Collection.
abstract int	size() Returns the number of elements in this Collection.
<T> T[]	toArray(T[] contents) Returns an array containing all elements contained in this Collection.
Object[]	toArray() Returns a new array containing all elements contained in this Collection.
String	toString() Returns the string representation of this Collection.

From class java.lang.Object

Object	clone() Returns a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
boolean	equals(Object o) Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison.
void	finalize() Called by the virtual machine when there are no longer any (non-weak) references to the receiver.
final Class<? extends Object>	getClass() Returns the unique instance of java.lang.Class which represents the class of the receiver.
int	hashCode() Returns an integer hash code for the receiver.
final void	notify() Causes one thread which is `wait` ing on the receiver to be made ready to run.
final void	notifyAll() Causes all threads which are `wait` ing on the receiver to be made ready to run.
String	toString() Returns a string containing a concise, human-readable description of the receiver.
final void	wait(long time, int frac) Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by `notify` or `notifyAll`) or the expiration of the timeout.
final void	wait(long time) Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by `notify` or `notifyAll`) or the expiration of the timeout.
final void	wait() Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by `notify` or `notifyAll`).

From interface java.lang.Iterable

From interface java.util.Collection

abstract boolean	add(E object) Attempts to add `object` to the contents of this `Collection`.
abstract boolean	addAll(Collection<? extends E> collection) Attempts to add all of the objects contained in `collection` to the contents of this collection.
abstract void	clear() Removes all elements from this Collection, leaving it empty.
abstract boolean	contains(Object object) Searches this Collection for the specified object.
abstract boolean	containsAll(Collection<?> collection) Searches this Collection for all objects in the specified Collection.
abstract boolean	equals(Object object) Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison.
abstract int	hashCode() Returns an integer hash code for the receiver.
abstract boolean	isEmpty() Returns if this Collection has no elements, a size of zero.
abstract Iterator<E>	iterator() Returns an instance of Iterator that may be used to access the objects contained by this collection.
abstract boolean	remove(Object object) Removes the first occurrence of the specified object from this Collection.
abstract boolean	removeAll(Collection<?> collection) Removes all occurrences in this Collection of each object in the specified Collection.
abstract boolean	retainAll(Collection<?> collection) Removes all objects from this Collection that are not also found in the contents of `collection`.
abstract int	size() Returns a count of how many objects are contained by this collection.
abstract <T> T[]	toArray(T[] array) Returns an array containing all elements contained in this Collection.
abstract Object[]	toArray() Returns a new array containing all elements contained in this Collection.

From interface java.util.List

abstract void	add(int location, E object) Inserts the specified object into this Vector at the specified location.
abstract boolean	add(E object) Adds the specified object at the end of this List.
abstract boolean	addAll(int location, Collection<? extends E> collection) Inserts the objects in the specified Collection at the specified location in this List.
abstract boolean	addAll(Collection<? extends E> collection) Adds the objects in the specified Collection to the end of this List.
abstract void	clear() Removes all elements from this List, leaving it empty.
abstract boolean	contains(Object object) Searches this List for the specified object.
abstract boolean	containsAll(Collection<?> collection) Searches this List for all objects in the specified Collection.
abstract boolean	equals(Object object) Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison.
abstract E	get(int location) Returns the element at the specified location in this List.
abstract int	hashCode() Returns an integer hash code for the receiver.
abstract int	indexOf(Object object) Searches this List for the specified object and returns the index of the first occurrence.
abstract boolean	isEmpty() Returns if this List has no elements, a size of zero.
abstract Iterator<E>	iterator() Returns an Iterator on the elements of this List.
abstract int	lastIndexOf(Object object) Searches this List for the specified object and returns the index of the last occurrence.
abstract ListIterator<E>	listIterator() Returns a ListIterator on the elements of this List.
abstract ListIterator<E>	listIterator(int location) Returns a ListIterator on the elements of this List.
abstract E	remove(int location) Removes the object at the specified location from this List.
abstract boolean	remove(Object object) Removes the first occurrence of the specified object from this List.
abstract boolean	removeAll(Collection<?> collection) Removes all occurrences in this List of each object in the specified Collection.
abstract boolean	retainAll(Collection<?> collection) Removes all objects from this List that are not contained in the specified Collection.
abstract E	set(int location, E object) Replaces the element at the specified location in this List with the specified object.
abstract int	size() Returns the number of elements in this List.
abstract List<E>	subList(int start, int end) Returns a List of the specified portion of this List from the start index to one less than the end index.
abstract <T> T[]	toArray(T[] array) Returns an array containing all elements contained in this List.
abstract Object[]	toArray() Returns an array containing all elements contained in this List.

Fields

protected int modCount

Protected Constructors

protected AbstractList ()

Constructs a new instance of this AbstractList.

Public Methods

public void add (int location, E object)

Inserts the specified object into this List at the specified location. The object is inserted before any previous element at the specified location. If the location is equal to the size of this List, the object is added at the end.

Parameters

location	the index at which to insert
object	the object to add

Throws

UnsupportedOperationException	when adding to this List is not supported
ClassCastException	when the class of the object is inappropriate for this List
IllegalArgumentException	when the object cannot be added to this List
IndexOutOfBoundsException	when `location < 0 \|\| >= size()`

public boolean add (E object)

Adds the specified object at the end of this List.

Parameters

object	the object to add

Returns

true

Throws

UnsupportedOperationException	when adding to this List is not supported
ClassCastException	when the class of the object is inappropriate for this List
IllegalArgumentException	when the object cannot be added to this List

public boolean addAll (int location, Collection<? extends E> collection)

Inserts the objects in the specified Collection at the specified location in this List. The objects are added in the order they are returned from the Collection iterator.

Parameters

location	the index at which to insert
collection	the Collection of objects

Returns

true if this List is modified, false otherwise

Throws

UnsupportedOperationException	when adding to this List is not supported
ClassCastException	when the class of an object is inappropriate for this List
IllegalArgumentException	when an object cannot be added to this List
IndexOutOfBoundsException	when `location < 0 \|\| >= size()`

public void clear ()

Removes all elements from this List, leaving it empty.

Throws

UnsupportedOperationException	when removing from this List is not supported

public boolean equals (Object object)

Compares the specified object to this List and answer if they are equal. The object must be a List which contains the same objects in the same order.

Parameters

object	the object to compare with this object

Returns

true if the specified object is equal to this List, false otherwise

public abstract E get (int location)

Returns the element at the specified location in this List.

Parameters

location	the index of the element to return

Returns

the element at the specified index

Throws

IndexOutOfBoundsException	when `location < 0 \|\| >= size()`

public int hashCode ()

Returns an integer hash code for the receiver. Objects which are equal answer the same value for this method.

Returns

the receiver's hash

public int indexOf (Object object)

Searches this List for the specified object and returns the index of the first occurrence.

Parameters

object	the object to search for

Returns

the index of the first occurrence of the object

public Iterator<E> iterator ()

Returns an Iterator on the elements of this List. The elements are iterated in the same order that they occur in the List.

Returns

an Iterator on the elements of this List

public int lastIndexOf (Object object)

Searches this List for the specified object and returns the index of the last occurrence.

Parameters

object	the object to search for

Returns

the index of the last occurrence of the object

public ListIterator<E> listIterator ()

Returns a ListIterator on the elements of this List. The elements are iterated in the same order that they occur in the List.

Returns

a ListIterator on the elements of this List

public ListIterator<E> listIterator (int location)

Returns a ListIterator on the elements of this List. The elements are iterated in the same order that they occur in the List. The iteration starts at the specified location.

Parameters

location	the index at which to start the iteration

Returns

a ListIterator on the elements of this List

Throws

IndexOutOfBoundsException	when `location < 0 \|\| >= size()`

public E remove (int location)

Removes the object at the specified location from this List.

Parameters

location	the index of the object to remove

Returns

the removed object

Throws

UnsupportedOperationException	when removing from this List is not supported
IndexOutOfBoundsException	when `location < 0 \|\| >= size()`

public E set (int location, E object)

Replaces the element at the specified location in this List with the specified object.

Parameters

location	the index at which to put the specified object
object	the object to add

Returns

the previous element at the index

Throws

UnsupportedOperationException	when replacing elements in this List is not supported
ClassCastException	when the class of an object is inappropriate for this List
IllegalArgumentException	when an object cannot be added to this List
IndexOutOfBoundsException	when `location < 0 \|\| >= size()`

public List<E> subList (int start, int end)

Returns a part of consecutive elements of this list as a view. From start (inclusive), to end(exclusive). The returned view will be of zero length if start equals end. Any change occurs in the returned subList will be reflected to the original list, and vice-versa. All the supported optional operations by the original list will also be supported by this subList. This method can be used as a handy method to do some operations on a sub range of the original list. For example: list.subList(from, to).clear(); If the original list is modified other than through the returned subList, the behavior of the returned subList becomes undefined. The returned subList is a subclass of AbstractList. The subclass stores offset, size of itself, and modCount of the original list. If the original list implements RandomAccess interface, the returned subList also implements RandomAccess interface. The subList's set(int, Object), get(int), add(int, Object), remove(int), addAll(int, Collection) and removeRange(int, int) methods first check the bounds, adjust offsets and then call the corresponding methods of the original AbstractList. addAll(Collection c) method of the returned subList calls the original addAll(offset + size, c). The listIterator(int) method of the subList wraps the original list iterator. The iterator() method of the subList invokes the original listIterator() method, and the size() method merely returns the size of the subList. All methods will throw a ConcurrentModificationException if the modCount of the original list is not equal to the expected value.

Parameters

start	start index of the subList, include start
end	end index of the subList, exclude end

Returns

a subList view of this list start from start (inclusive), end with end (exclusive)

Throws

IndexOutOfBoundsException	when (start < 0 \|\| end > size())
IllegalArgumentException	when (start > end)

Protected Methods

protected void removeRange (int start, int end)

Removes the objects in the specified range from the start to the, but not including, end index.

Parameters

start	the index at which to start removing
end	the index one past the end of the range to remove

Throws

UnsupportedOperationException	when removing from this List is not supported
IndexOutOfBoundsException	when `start < 0`

Jan	FEB	Mar
	18
2008	2009	2010

Interfaces

Classes

Enums

Exceptions

AbstractList

Class Overview

Summary

Fields

protected int modCount

Protected Constructors

protected AbstractList ()

Public Methods

public void add (int location, E object)

Parameters

Throws

public boolean add (E object)

Parameters

Returns

Throws

public boolean addAll (int location, Collection<? extends E> collection)

Parameters

Returns

Throws

public void clear ()

Throws

See Also

public boolean equals (Object object)

Parameters

Returns

See Also

public abstract E get (int location)

Parameters

Returns

Throws

public int hashCode ()

Returns

See Also

public int indexOf (Object object)

Parameters

Returns

public Iterator<E> iterator ()

Returns

See Also

public int lastIndexOf (Object object)

Parameters

Returns

public ListIterator<E> listIterator ()

Returns

See Also

public ListIterator<E> listIterator (int location)

Parameters

Returns

Throws

See Also

public E remove (int location)

Parameters

Returns

Throws

public E set (int location, E object)

Parameters

Returns

Throws

public List<E> subList (int start, int end)

Parameters

Returns

Throws

Protected Methods

protected void removeRange (int start, int end)

Parameters

Throws