java.util
Class AbstractList<E>

java.lang.Object sample code for java.lang.Object definition code for java.lang.Object 
  extended by java.util.AbstractCollection sample code for java.util.AbstractCollection definition code for java.util.AbstractCollection <E>
      extended by java.util.AbstractList<E>
All Implemented Interfaces:
Iterable sample code for java.lang.Iterable definition code for java.lang.Iterable <E>, Collection sample code for java.util.Collection definition code for java.util.Collection <E>, List sample code for java.util.List definition code for java.util.List <E>
Direct Known Subclasses:
AbstractSequentialList sample code for java.util.AbstractSequentialList definition code for java.util.AbstractSequentialList , ArrayList sample code for java.util.ArrayList definition code for java.util.ArrayList , Vector sample code for java.util.Vector definition code for java.util.Vector

public abstract class AbstractList<E>
extends AbstractCollection sample code for java.util.AbstractCollection definition code for java.util.AbstractCollection <E>
implements List sample code for java.util.List definition code for java.util.List <E>

This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array). For sequential access data (such as a linked list), AbstractSequentialList should be used in preference to this class.

To implement an unmodifiable list, the programmer needs only to extend this class and provide implementations for the get(int index) and size() methods.

To implement a modifiable list, the programmer must additionally override the set(int index, Object element) method (which otherwise throws an UnsupportedOperationException. If the list is variable-size the programmer must additionally override the add(int index, Object element) and remove(int index) methods.

The programmer should generally provide a void (no argument) and collection constructor, as per the recommendation in the Collection interface specification.

Unlike the other abstract collection implementations, the programmer does not have to provide an iterator implementation; the iterator and list iterator are implemented by this class, on top the "random access" methods: get(int index), set(int index, Object element), set(int index, Object element), add(int index, Object element) and remove(int index).

The documentation for each non-abstract methods in this class describes its implementation in detail. Each of these methods may be overridden if the collection being implemented admits a more efficient implementation.

This class is a member of the Java Collections Framework.

Since:
1.2
See Also:
Collection sample code for java.util.Collection definition code for java.util.Collection , List sample code for java.util.List definition code for java.util.List , AbstractSequentialList sample code for java.util.AbstractSequentialList definition code for java.util.AbstractSequentialList , AbstractCollection sample code for java.util.AbstractCollection definition code for java.util.AbstractCollection

Field Summary
protected  int modCount sample code for java.util.AbstractList.modCount definition code for java.util.AbstractList.modCount
          The number of times this list has been structurally modified.
 
Constructor Summary
protected AbstractList sample code for java.util.AbstractList.AbstractList() definition code for java.util.AbstractList.AbstractList() ()
          Sole constructor.
 
Method Summary
 boolean add sample code for java.util.AbstractList.add(E) definition code for java.util.AbstractList.add(E) (E o)
          Appends the specified element to the end of this List (optional operation).
 void add sample code for java.util.AbstractList.add(int, E) definition code for java.util.AbstractList.add(int, E) (int index, E element)
          Inserts the specified element at the specified position in this list (optional operation).
 boolean addAll sample code for java.util.AbstractList.addAll(int, java.util.Collection) definition code for java.util.AbstractList.addAll(int, java.util.Collection) (int index, Collection sample code for java.util.Collection definition code for java.util.Collection <? extends E> c)
          Inserts all of the elements in the specified collection into this list at the specified position (optional operation).
 void clear sample code for java.util.AbstractList.clear() definition code for java.util.AbstractList.clear() ()
          Removes all of the elements from this collection (optional operation).
 boolean equals sample code for java.util.AbstractList.equals(java.lang.Object) definition code for java.util.AbstractList.equals(java.lang.Object) (Object sample code for java.lang.Object definition code for java.lang.Object  o)
          Compares the specified object with this list for equality.
abstract  E get sample code for java.util.AbstractList.get(int) definition code for java.util.AbstractList.get(int) (int index)
          Returns the element at the specified position in this list.
 int hashCode sample code for java.util.AbstractList.hashCode() definition code for java.util.AbstractList.hashCode() ()
          Returns the hash code value for this list.
 int indexOf sample code for java.util.AbstractList.indexOf(java.lang.Object) definition code for java.util.AbstractList.indexOf(java.lang.Object) (Object sample code for java.lang.Object definition code for java.lang.Object  o)
          Returns the index in this list of the first occurence of the specified element, or -1 if the list does not contain this element.
 Iterator sample code for java.util.Iterator definition code for java.util.Iterator <E> iterator sample code for java.util.AbstractList.iterator() definition code for java.util.AbstractList.iterator() ()
          Returns an iterator over the elements in this list in proper sequence.
 int lastIndexOf sample code for java.util.AbstractList.lastIndexOf(java.lang.Object) definition code for java.util.AbstractList.lastIndexOf(java.lang.Object) (Object sample code for java.lang.Object definition code for java.lang.Object  o)
          Returns the index in this list of the last occurence of the specified element, or -1 if the list does not contain this element.
 ListIterator sample code for java.util.ListIterator definition code for java.util.ListIterator <E> listIterator sample code for java.util.AbstractList.listIterator() definition code for java.util.AbstractList.listIterator() ()
          Returns an iterator of the elements in this list (in proper sequence).
 ListIterator sample code for java.util.ListIterator definition code for java.util.ListIterator <E> listIterator sample code for java.util.AbstractList.listIterator(int) definition code for java.util.AbstractList.listIterator(int) (int index)
          Returns a list iterator of the elements in this list (in proper sequence), starting at the specified position in the list.
 E remove sample code for java.util.AbstractList.remove(int) definition code for java.util.AbstractList.remove(int) (int index)
          Removes the element at the specified position in this list (optional operation).
protected  void removeRange sample code for java.util.AbstractList.removeRange(int, int) definition code for java.util.AbstractList.removeRange(int, int) (int fromIndex, int toIndex)
          Removes from this list all of the elements whose index is between fromIndex, inclusive, and toIndex, exclusive.
 E set sample code for java.util.AbstractList.set(int, E) definition code for java.util.AbstractList.set(int, E) (int index, E element)
          Replaces the element at the specified position in this list with the specified element (optional operation).
 List sample code for java.util.List definition code for java.util.List <E> subList sample code for java.util.AbstractList.subList(int, int) definition code for java.util.AbstractList.subList(int, int) (int fromIndex, int toIndex)
          Returns a view of the portion of this list between fromIndex, inclusive, and toIndex, exclusive.
 
Methods inherited from class java.util.AbstractCollection sample code for java.util.AbstractCollection definition code for java.util.AbstractCollection
addAll sample code for java.util.AbstractCollection.addAll(java.util.Collection) definition code for java.util.AbstractCollection.addAll(java.util.Collection) , contains sample code for java.util.AbstractCollection.contains(java.lang.Object) definition code for java.util.AbstractCollection.contains(java.lang.Object) , containsAll sample code for java.util.AbstractCollection.containsAll(java.util.Collection) definition code for java.util.AbstractCollection.containsAll(java.util.Collection) , isEmpty sample code for java.util.AbstractCollection.isEmpty() definition code for java.util.AbstractCollection.isEmpty() , remove sample code for java.util.AbstractCollection.remove(java.lang.Object) definition code for java.util.AbstractCollection.remove(java.lang.Object) , removeAll sample code for java.util.AbstractCollection.removeAll(java.util.Collection) definition code for java.util.AbstractCollection.removeAll(java.util.Collection) , retainAll sample code for java.util.AbstractCollection.retainAll(java.util.Collection) definition code for java.util.AbstractCollection.retainAll(java.util.Collection) , size sample code for java.util.AbstractCollection.size() definition code for java.util.AbstractCollection.size() , toArray sample code for java.util.AbstractCollection.toArray() definition code for java.util.AbstractCollection.toArray() , toArray sample code for java.util.AbstractCollection.toArray(T[]) definition code for java.util.AbstractCollection.toArray(T[]) , toString sample code for java.util.AbstractCollection.toString() definition code for java.util.AbstractCollection.toString()
 
Methods inherited from class java.lang.Object sample code for java.lang.Object definition code for java.lang.Object
clone sample code for java.lang.Object.clone() definition code for java.lang.Object.clone() , finalize sample code for java.lang.Object.finalize() definition code for java.lang.Object.finalize() , getClass sample code for java.lang.Object.getClass() definition code for java.lang.Object.getClass() , notify sample code for java.lang.Object.notify() definition code for java.lang.Object.notify() , notifyAll sample code for java.lang.Object.notifyAll() definition code for java.lang.Object.notifyAll() , wait sample code for java.lang.Object.wait() definition code for java.lang.Object.wait() , wait sample code for java.lang.Object.wait(long) definition code for java.lang.Object.wait(long) , wait sample code for java.lang.Object.wait(long, int) definition code for java.lang.Object.wait(long, int)
 
Methods inherited from interface java.util.List sample code for java.util.List definition code for java.util.List
addAll sample code for java.util.List.addAll(java.util.Collection) definition code for java.util.List.addAll(java.util.Collection) , contains sample code for java.util.List.contains(java.lang.Object) definition code for java.util.List.contains(java.lang.Object) , containsAll sample code for java.util.List.containsAll(java.util.Collection) definition code for java.util.List.containsAll(java.util.Collection) , isEmpty sample code for java.util.List.isEmpty() definition code for java.util.List.isEmpty() , remove sample code for java.util.List.remove(java.lang.Object) definition code for java.util.List.remove(java.lang.Object) , removeAll sample code for java.util.List.removeAll(java.util.Collection) definition code for java.util.List.removeAll(java.util.Collection) , retainAll sample code for java.util.List.retainAll(java.util.Collection) definition code for java.util.List.retainAll(java.util.Collection) , size sample code for java.util.List.size() definition code for java.util.List.size() , toArray sample code for java.util.List.toArray() definition code for java.util.List.toArray() , toArray sample code for java.util.List.toArray(T[]) definition code for java.util.List.toArray(T[])
 

Field Detail

modCount sample code for java.util.AbstractList.modCount

protected transient int modCount
The number of times this list has been structurally modified. Structural modifications are those that change the size of the list, or otherwise perturb it in such a fashion that iterations in progress may yield incorrect results.

This field is used by the iterator and list iterator implementation returned by the iterator and listIterator methods. If the value of this field changes unexpectedly, the iterator (or list iterator) will throw a ConcurrentModificationException in response to the next, remove, previous, set or add operations. This provides fail-fast behavior, rather than non-deterministic behavior in the face of concurrent modification during iteration.

Use of this field by subclasses is optional. If a subclass wishes to provide fail-fast iterators (and list iterators), then it merely has to increment this field in its add(int, Object) and remove(int) methods (and any other methods that it overrides that result in structural modifications to the list). A single call to add(int, Object) or remove(int) must add no more than one to this field, or the iterators (and list iterators) will throw bogus ConcurrentModificationExceptions. If an implementation does not wish to provide fail-fast iterators, this field may be ignored.

Constructor Detail

AbstractList sample code for java.util.AbstractList() definition code for java.util.AbstractList()

protected AbstractList()
Sole constructor. (For invocation by subclass constructors, typically implicit.)

Method Detail

add sample code for java.util.AbstractList.add(E) definition code for java.util.AbstractList.add(E)

public boolean add(E o)
Appends the specified element to the end of this List (optional operation).

This implementation calls add(size(), o).

Note that this implementation throws an UnsupportedOperationException unless add(int, Object) is overridden.

Specified by:
add sample code for java.util.Collection.add(E) definition code for java.util.Collection.add(E) in interface Collection sample code for java.util.Collection definition code for java.util.Collection <E>
Specified by:
add sample code for java.util.List.add(E) definition code for java.util.List.add(E) in interface List sample code for java.util.List definition code for java.util.List <E>
Overrides:
add sample code for java.util.AbstractCollection.add(E) definition code for java.util.AbstractCollection.add(E) in class AbstractCollection sample code for java.util.AbstractCollection definition code for java.util.AbstractCollection <E>
Parameters:
o - element to be appended to this list.
Returns:
true (as per the general contract of Collection.add).
Throws:
UnsupportedOperationException sample code for java.lang.UnsupportedOperationException definition code for java.lang.UnsupportedOperationException - if the add method is not supported by this Set.
ClassCastException sample code for java.lang.ClassCastException definition code for java.lang.ClassCastException - if the class of the specified element prevents it from being added to this set.
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - some aspect of this element prevents it from being added to this collection.

get sample code for java.util.AbstractList.get(int) definition code for java.util.AbstractList.get(int)

public abstract E get(int index)
Returns the element at the specified position in this list.

Specified by:
get sample code for java.util.List.get(int) definition code for java.util.List.get(int) in interface List sample code for java.util.List definition code for java.util.List <E>
Parameters:
index - index of element to return.
Returns:
the element at the specified position in this list.
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if the given index is out of range (index < 0 || index >= size()).

set sample code for java.util.AbstractList.set(int, E) definition code for java.util.AbstractList.set(int, E)

public E set(int index,
             E element)
Replaces the element at the specified position in this list with the specified element (optional operation).

This implementation always throws an UnsupportedOperationException.

Specified by:
set sample code for java.util.List.set(int, E) definition code for java.util.List.set(int, E) in interface List sample code for java.util.List definition code for java.util.List <E>
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:
UnsupportedOperationException sample code for java.lang.UnsupportedOperationException definition code for java.lang.UnsupportedOperationException - if the set method is not supported by this List.
ClassCastException sample code for java.lang.ClassCastException definition code for java.lang.ClassCastException - if the class of the specified element prevents it from being added to this list.
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - if some aspect of the specified element prevents it from being added to this list.
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if the specified index is out of range (index < 0 || index >= size()).

add sample code for java.util.AbstractList.add(int, E) definition code for java.util.AbstractList.add(int, E)

public void add(int index,
                E element)
Inserts the specified element at the specified position in this list (optional operation). Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one to their indices).

This implementation always throws an UnsupportedOperationException.

Specified by:
add sample code for java.util.List.add(int, E) definition code for java.util.List.add(int, E) in interface List sample code for java.util.List definition code for java.util.List <E>
Parameters:
index - index at which the specified element is to be inserted.
element - element to be inserted.
Throws:
UnsupportedOperationException sample code for java.lang.UnsupportedOperationException definition code for java.lang.UnsupportedOperationException - if the add method is not supported by this list.
ClassCastException sample code for java.lang.ClassCastException definition code for java.lang.ClassCastException - if the class of the specified element prevents it from being added to this list.
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - if some aspect of the specified element prevents it from being added to this list.
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - index is out of range (index < 0 || index > size()).

remove sample code for java.util.AbstractList.remove(int) definition code for java.util.AbstractList.remove(int)

public E remove(int index)
Removes the element at the specified position in this list (optional operation). Shifts any subsequent elements to the left (subtracts one from their indices). Returns the element that was removed from the list.

This implementation always throws an UnsupportedOperationException.

Specified by:
remove sample code for java.util.List.remove(int) definition code for java.util.List.remove(int) in interface List sample code for java.util.List definition code for java.util.List <E>
Parameters:
index - the index of the element to remove.
Returns:
the element previously at the specified position.
Throws:
UnsupportedOperationException sample code for java.lang.UnsupportedOperationException definition code for java.lang.UnsupportedOperationException - if the remove method is not supported by this list.
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if the specified index is out of range (index < 0 || index >= size()).

indexOf sample code for java.util.AbstractList.indexOf(java.lang.Object) definition code for java.util.AbstractList.indexOf(java.lang.Object)

public int indexOf(Object sample code for java.lang.Object definition code for java.lang.Object  o)
Returns the index in this list of the first occurence of the specified element, or -1 if the list does not contain this element. More formally, returns the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index.

This implementation first gets a list iterator (with listIterator()). Then, it iterates over the list until the specified element is found or the end of the list is reached.

Specified by:
indexOf sample code for java.util.List.indexOf(java.lang.Object) definition code for java.util.List.indexOf(java.lang.Object) in interface List sample code for java.util.List definition code for java.util.List <E>
Parameters:
o - element to search for.
Returns:
the index in this List of the first occurence of the specified element, or -1 if the List does not contain this element.

lastIndexOf sample code for java.util.AbstractList.lastIndexOf(java.lang.Object) definition code for java.util.AbstractList.lastIndexOf(java.lang.Object)

public int lastIndexOf(Object sample code for java.lang.Object definition code for java.lang.Object  o)
Returns the index in this list of the last occurence of the specified element, or -1 if the list does not contain this element. More formally, returns the highest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index.

This implementation first gets a list iterator that points to the end of the list (with listIterator(size())). Then, it iterates backwards over the list until the specified element is found, or the beginning of the list is reached.

Specified by:
lastIndexOf sample code for java.util.List.lastIndexOf(java.lang.Object) definition code for java.util.List.lastIndexOf(java.lang.Object) in interface List sample code for java.util.List definition code for java.util.List <E>
Parameters:
o - element to search for.
Returns:
the index in this list of the last occurence of the specified element, or -1 if the list does not contain this element.

clear sample code for java.util.AbstractList.clear() definition code for java.util.AbstractList.clear()

public void clear()
Removes all of the elements from this collection (optional operation). The collection will be empty after this call returns (unless it throws an exception).

This implementation calls removeRange(0, size()).

Note that this implementation throws an UnsupportedOperationException unless remove(int index) or removeRange(int fromIndex, int toIndex) is overridden.

Specified by:
clear sample code for java.util.Collection.clear() definition code for java.util.Collection.clear() in interface Collection sample code for java.util.Collection definition code for java.util.Collection <E>
Specified by:
clear sample code for java.util.List.clear() definition code for java.util.List.clear() in interface List sample code for java.util.List definition code for java.util.List <E>
Overrides:
clear sample code for java.util.AbstractCollection.clear() definition code for java.util.AbstractCollection.clear() in class AbstractCollection sample code for java.util.AbstractCollection definition code for java.util.AbstractCollection <E>
Throws:
UnsupportedOperationException sample code for java.lang.UnsupportedOperationException definition code for java.lang.UnsupportedOperationException - if the clear method is not supported by this Collection.

addAll sample code for java.util.AbstractList.addAll(int, java.util.Collection<? extends E>) definition code for java.util.AbstractList.addAll(int, java.util.Collection<? extends E>)

public boolean addAll(int index,
                      Collection sample code for java.util.Collection definition code for java.util.Collection <? extends E> c)
Inserts all of the elements in the specified collection into this list at the specified position (optional operation). Shifts the element currently at that position (if any) and any subsequent elements to the right (increases their indices). The new elements will appear in the list in the order that they are returned by the specified collection's iterator. The behavior of this operation is unspecified if the specified collection is modified while the operation is in progress. (Note that this will occur if the specified collection is this list, and it's nonempty.)

This implementation gets an iterator over the specified collection and iterates over it, inserting the elements obtained from the iterator into this list at the appropriate position, one at a time, using add(int, Object). Many implementations will override this method for efficiency.

Note that this implementation throws an UnsupportedOperationException unless add(int, Object) is overridden.

Specified by:
addAll sample code for java.util.List.addAll(int, java.util.Collection) definition code for java.util.List.addAll(int, java.util.Collection) in interface List sample code for java.util.List definition code for java.util.List <E>
Parameters:
index - index at which to insert the first element from the specified collection.
c - elements to be inserted into this List.
Returns:
true if this list changed as a result of the call.
Throws:
UnsupportedOperationException sample code for java.lang.UnsupportedOperationException definition code for java.lang.UnsupportedOperationException - if the addAll method is not supported by this list.
ClassCastException sample code for java.lang.ClassCastException definition code for java.lang.ClassCastException - if the class of an element of the specified collection prevents it from being added to this List.
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - some aspect an element of the specified collection prevents it from being added to this List.
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - index out of range (index < 0 || index > size()).
NullPointerException sample code for java.lang.NullPointerException definition code for java.lang.NullPointerException - if the specified collection is null.

iterator sample code for java.util.AbstractList.iterator() definition code for java.util.AbstractList.iterator()

public Iterator sample code for java.util.Iterator definition code for java.util.Iterator <E> iterator()
Returns an iterator over the elements in this list in proper sequence.

This implementation returns a straightforward implementation of the iterator interface, relying on the backing list's size(), get(int), and remove(int) methods.

Note that the iterator returned by this method will throw an UnsupportedOperationException in response to its remove method unless the list's remove(int) method is overridden.

This implementation can be made to throw runtime exceptions in the face of concurrent modification, as described in the specification for the (protected) modCount field.

Specified by:
iterator sample code for java.lang.Iterable.iterator() definition code for java.lang.Iterable.iterator() in interface Iterable sample code for java.lang.Iterable definition code for java.lang.Iterable <E>
Specified by:
iterator sample code for java.util.Collection.iterator() definition code for java.util.Collection.iterator() in interface Collection sample code for java.util.Collection definition code for java.util.Collection <E>
Specified by:
iterator sample code for java.util.List.iterator() definition code for java.util.List.iterator() in interface List sample code for java.util.List definition code for java.util.List <E>
Specified by:
iterator sample code for java.util.AbstractCollection.iterator() definition code for java.util.AbstractCollection.iterator() in class AbstractCollection sample code for java.util.AbstractCollection definition code for java.util.AbstractCollection <E>
Returns:
an iterator over the elements in this list in proper sequence.
See Also:
modCount sample code for java.util.AbstractList.modCount definition code for java.util.AbstractList.modCount

listIterator sample code for java.util.AbstractList.listIterator() definition code for java.util.AbstractList.listIterator()

public ListIterator sample code for java.util.ListIterator definition code for java.util.ListIterator <E> listIterator()
Returns an iterator of the elements in this list (in proper sequence). This implementation returns listIterator(0).

Specified by:
listIterator sample code for java.util.List.listIterator() definition code for java.util.List.listIterator() in interface List sample code for java.util.List definition code for java.util.List <E>
Returns:
an iterator of the elements in this list (in proper sequence).
See Also:
listIterator(int) sample code for java.util.AbstractList.listIterator(int) definition code for java.util.AbstractList.listIterator(int)

listIterator sample code for java.util.AbstractList.listIterator(int) definition code for java.util.AbstractList.listIterator(int)

public ListIterator sample code for java.util.ListIterator definition code for java.util.ListIterator <E> listIterator(int index)
Returns a list iterator of the elements in this list (in proper sequence), starting at the specified position in the list. The specified index indicates the first element that would be returned by an initial call to the next method. An initial call to the previous method would return the element with the specified index minus one.

This implementation returns a straightforward implementation of the ListIterator interface that extends the implementation of the Iterator interface returned by the iterator() method. The ListIterator implementation relies on the backing list's get(int), set(int, Object), add(int, Object) and remove(int) methods.

Note that the list iterator returned by this implementation will throw an UnsupportedOperationException in response to its remove, set and add methods unless the list's remove(int), set(int, Object), and add(int, Object) methods are overridden.

This implementation can be made to throw runtime exceptions in the face of concurrent modification, as described in the specification for the (protected) modCount field.

Specified by:
listIterator sample code for java.util.List.listIterator(int) definition code for java.util.List.listIterator(int) in interface List sample code for java.util.List definition code for java.util.List <E>
Parameters:
index - index of the first element to be returned from the list iterator (by a call to the next method).
Returns:
a list iterator of the elements in this list (in proper sequence), starting at the specified position in the list.
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if the specified index is out of range (index < 0 || index > size()).
See Also:
modCount sample code for java.util.AbstractList.modCount definition code for java.util.AbstractList.modCount

subList sample code for java.util.AbstractList.subList(int, int) definition code for java.util.AbstractList.subList(int, int)

public List sample code for java.util.List definition code for java.util.List <E> subList(int fromIndex,
                       int toIndex)
Returns a view of the portion of this list between fromIndex, inclusive, and toIndex, exclusive. (If fromIndex and toIndex are equal, the returned list is empty.) The returned list is backed by this list, so changes in the returned list are reflected in this list, and vice-versa. The returned list supports all of the optional list operations supported by this list.

This method eliminates the need for explicit range operations (of the sort that commonly exist for arrays). Any operation that expects a list can be used as a range operation by operating on a subList view instead of a whole list. For example, the following idiom removes a range of elements from a list:

     list.subList(from, to).clear();
 
Similar idioms may be constructed for indexOf and lastIndexOf, and all of the algorithms in the Collections class can be applied to a subList.

The semantics of the list returned by this method become undefined if the backing list (i.e., this list) is structurally modified in any way other than via the returned list. (Structural modifications are those that change the size of the list, or otherwise perturb it in such a fashion that iterations in progress may yield incorrect results.)

This implementation returns a list that subclasses AbstractList. The subclass stores, in private fields, the offset of the subList within the backing list, the size of the subList (which can change over its lifetime), and the expected modCount value of the backing list. There are two variants of the subclass, one of which implements RandomAccess. If this list implements RandomAccess the returned list will be an instance of the subclass that implements RandomAccess.

The subclass's set(int, Object), get(int), add(int, Object), remove(int), addAll(int, Collection) and removeRange(int, int) methods all delegate to the corresponding methods on the backing abstract list, after bounds-checking the index and adjusting for the offset. The addAll(Collection c) method merely returns addAll(size, c).

The listIterator(int) method returns a "wrapper object" over a list iterator on the backing list, which is created with the corresponding method on the backing list. The iterator method merely returns listIterator(), and the size method merely returns the subclass's size field.

All methods first check to see if the actual modCount of the backing list is equal to its expected value, and throw a ConcurrentModificationException if it is not.

Specified by:
subList sample code for java.util.List.subList(int, int) definition code for java.util.List.subList(int, int) in interface List sample code for java.util.List definition code for java.util.List <E>
Parameters:
fromIndex - low endpoint (inclusive) of the subList.
toIndex - high endpoint (exclusive) of the subList.
Returns:
a view of the specified range within this list.
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - endpoint index value out of range (fromIndex < 0 || toIndex > size)
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - endpoint indices out of order (fromIndex > toIndex)

equals sample code for java.util.AbstractList.equals(java.lang.Object) definition code for java.util.AbstractList.equals(java.lang.Object)

public boolean equals(Object sample code for java.lang.Object definition code for java.lang.Object  o)
Compares the specified object with this list for equality. Returns true if and only if the specified object is also a list, both lists have the same size, and all corresponding pairs of elements in the two lists are equal. (Two elements e1 and e2 are equal if (e1==null ? e2==null : e1.equals(e2)).) In other words, two lists are defined to be equal if they contain the same elements in the same order.

This implementation first checks if the specified object is this list. If so, it returns true; if not, it checks if the specified object is a list. If not, it returns false; if so, it iterates over both lists, comparing corresponding pairs of elements. If any comparison returns false, this method returns false. If either iterator runs out of elements before the other it returns false (as the lists are of unequal length); otherwise it returns true when the iterations complete.

Specified by:
equals sample code for java.util.Collection.equals(java.lang.Object) definition code for java.util.Collection.equals(java.lang.Object) in interface Collection sample code for java.util.Collection definition code for java.util.Collection <E>
Specified by:
equals sample code for java.util.List.equals(java.lang.Object) definition code for java.util.List.equals(java.lang.Object) in interface List sample code for java.util.List definition code for java.util.List <E>
Overrides:
equals sample code for java.lang.Object.equals(java.lang.Object) definition code for java.lang.Object.equals(java.lang.Object) in class Object sample code for java.lang.Object definition code for java.lang.Object
Parameters:
o - the object to be compared for equality with this list.
Returns:
true if the specified object is equal to this list.
See Also:
Object.hashCode() sample code for java.lang.Object.hashCode() definition code for java.lang.Object.hashCode() , Hashtable sample code for java.util.Hashtable definition code for java.util.Hashtable

hashCode sample code for java.util.AbstractList.hashCode() definition code for java.util.AbstractList.hashCode()

public int hashCode()
Returns the hash code value for this list.

This implementation uses exactly the code that is used to define the list hash function in the documentation for the List.hashCode method.

Specified by:
hashCode sample code for java.util.Collection.hashCode() definition code for java.util.Collection.hashCode() in interface Collection sample code for java.util.Collection definition code for java.util.Collection <E>
Specified by:
hashCode sample code for java.util.List.hashCode() definition code for java.util.List.hashCode() in interface List sample code for java.util.List definition code for java.util.List <E>
Overrides:
hashCode sample code for java.lang.Object.hashCode() definition code for java.lang.Object.hashCode() in class Object sample code for java.lang.Object definition code for java.lang.Object
Returns:
the hash code value for this list.
See Also:
Object.equals(java.lang.Object) sample code for java.lang.Object.equals(java.lang.Object) definition code for java.lang.Object.equals(java.lang.Object) , Hashtable sample code for java.util.Hashtable definition code for java.util.Hashtable

removeRange sample code for java.util.AbstractList.removeRange(int, int) definition code for java.util.AbstractList.removeRange(int, int)

protected void removeRange(int fromIndex,
                           int toIndex)
Removes from this list all of the elements whose index is between fromIndex, inclusive, and toIndex, exclusive. Shifts any succeeding elements to the left (reduces their index). This call shortens the ArrayList by (toIndex - fromIndex) elements. (If toIndex==fromIndex, this operation has no effect.)

This method is called by the clear operation on this list and its subLists. Overriding this method to take advantage of the internals of the list implementation can substantially improve the performance of the clear operation on this list and its subLists.

This implementation gets a list iterator positioned before fromIndex, and repeatedly calls ListIterator.next followed by ListIterator.remove until the entire range has been removed. Note: if ListIterator.remove requires linear time, this implementation requires quadratic time.

Parameters:
fromIndex - index of first element to be removed.
toIndex - index after last element to be removed.