Appends the specified element to the end of this list (optional operation).

Lists that support this operation may place limitations on what elements may be added to this list. In particular, some lists will refuse to add null elements, and others will impose restrictions on the type of elements that may be added. List classes should clearly specify in their documentation any restrictions on what elements may be added.

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

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

e	element to be appended to this list
return	true (as specified by Collection#add)
Throws	UnsupportedOperationException: if the add operation is not supported by this list
Throws	ClassCastException: if the class of the specified element prevents it from being added to this list
Throws	NullPointerException: if the specified element is null and this list does not permit null elements
Throws	IllegalArgumentException: if some property of this element prevents it from being added to this list

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.

Throws	UnsupportedOperationException: if the add operation is not supported by this list
Throws	ClassCastException: if the class of the specified element prevents it from being added to this list
Throws	NullPointerException: if the specified element is null and this list does not permit null elements
Throws	IllegalArgumentException: if some property of the specified element prevents it from being added to this list
Throws	IndexOutOfBoundsException: if the index is out of range (index < 0 || index > size())

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 this list in the order that they are returned by the specified collection's iterator. The behavior of this operation is undefined 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, E). Many implementations will override this method for efficiency.

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

Throws	UnsupportedOperationException: if the addAll operation is not supported by this list
Throws	ClassCastException: if the class of an element of the specified collection prevents it from being added to this list
Throws	NullPointerException: if the specified collection contains one or more null elements and this list does not permit null elements, or if the specified collection is null
Throws	IllegalArgumentException: if some property of an element of the specified collection prevents it from being added to this list
Throws	IndexOutOfBoundsException: if the index is out of range (index < 0 || index > size())

Removes all of the elements from this list (optional operation). The list will be empty after this call returns.

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.

Throws

UnsupportedOperationException: if the clear operation is not supported by this list

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.

o	the object to be compared for equality with this list
return	true if the specified object is equal to this list

Returns the element at the specified position in this list.

Throws

IndexOutOfBoundsException: if the index is out of range (index < 0 || index >= size())

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.

return

the hash code value for this list

Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the 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.

Throws	ClassCastException: if the type of the specified element is incompatible with this list (optional)
Throws	NullPointerException: if the specified element is null and this list does not permit null elements (optional)

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.

return	an iterator over the elements in this list in proper sequence
See also	modCount

Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the 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.

Throws	ClassCastException: if the type of the specified element is incompatible with this list (optional)
Throws	NullPointerException: if the specified element is null and this list does not permit null elements (optional)

Returns a list iterator over the elements in this list (in proper sequence).

This implementation returns listIterator(0).

See also

listIterator(int)

Returns a list iterator of the elements in this list (in proper sequence), starting at the specified position in this list. The specified index indicates the first element that would be returned by an initial call to next. An initial call to previous 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, E), add(int, E) 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, E), and add(int, E) 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.

Throws	IndexOutOfBoundsException: if the index is out of range (index < 0 || index > size())
See also	modCount

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.

Throws	UnsupportedOperationException: if the remove operation is not supported by this list
Throws	IndexOutOfBoundsException: if the index is out of range (index < 0 || index >= size())

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.

fromIndex	index of first element to be removed
toIndex	index after last element to be removed

Replaces the element at the specified position in this list with the specified element (optional operation).

This implementation always throws an UnsupportedOperationException.

Throws	UnsupportedOperationException: if the set operation is not supported by this list
Throws	ClassCastException: if the class of the specified element prevents it from being added to this list
Throws	NullPointerException: if the specified element is null and this list does not permit null elements
Throws	IllegalArgumentException: if some property of the specified element prevents it from being added to this list
Throws	IndexOutOfBoundsException: if the index is out of range (index < 0 || index >= size())

Returns a view of the portion of this list between the specified 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 non-structural 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 passing 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 this 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, E), get(int), add(int, E), 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.

Throws	IndexOutOfBoundsException: endpoint index value out of range (fromIndex < 0 || toIndex > size)
Throws	IllegalArgumentException: if the endpoint indices are out of order (fromIndex > toIndex)