public boolean add(long element)
Appends the specified element to the end of me
(optional operation). Returns true
iff I changed as a result of this call.

If a collection refuses to add the specified
element for any reason other than that it already contains
the element, it must throw an exception (rather than
simply returning false). This preserves the invariant
that a collection always contains the specified element after
this call returns.

 public  void add(int index,
    long element)
Inserts the specified element at the specified position
(optional operation). Shifts the element currently
at that position (if any) and any subsequent elements to the
right, increasing their indices.

 public boolean addAll(int index,
    LongCollection collection)
Inserts all of the elements in the specified collection into me,
at the specified position (optional operation). Shifts the
element currently at that position (if any) and any subsequent
elements to the right, increasing their indices. The new elements
will appear in the order that they are returned by the given
collection's  iterator .

 public boolean equals(Object that)
Returns true iff that is an LongList
that contains the same elements in the same order as me.
In other words, returns true iff that is
an LongList that has the same  size  as me,
and for which the elements returned by its
 iterator  are equal (==) to
the corresponding elements within me.
(This contract ensures that this method works properly across
different implementations of the LongList interface.)

 public long get(int index)
Returns the value of the element at the specified position
within me.

 public int hashCode()
Returns my hash code.

The hash code of an LongList is defined to be the
result of the following calculation:
 int hash = 1;
for(LongIterator iter = iterator(); iter.hasNext(); ) {
long value = iter.next();
hash = 31*hash + (int)(value ^ (value >>> 32));
}

This contract ensures that this method is consistent with
 equals  and with the
 hashCode 
method of a List  of Long s.

 public int indexOf(long element)
Returns the index of the first occurrence
of the specified element within me,
or -1 if I do not contain
the element.

 public LongIterator iterator()
Returns an iterator  over all my elements,
in the appropriate sequence.

 public int lastIndexOf(long element)
Returns the index of the last occurrence
of the specified element within me,
or -1 if I do not contain the element.

 public LongListIterator listIterator()
Returns a
bidirectional iterator 
over all my elements, in the appropriate sequence.

 public LongListIterator listIterator(int index)
Returns a
bidirectional iterator 
over all my elements, in the appropriate sequence,
starting at the specified position. 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.

 public long removeElementAt(int index)
Removes the element at the specified position in
(optional operation). Any subsequent elements
are shifted to the left, subtracting one from their
indices. Returns the element that was removed.

 public long set(int index,
    long element)
Replaces the element at the specified
position in me with the specified element
(optional operation).

 public LongList subList(int fromIndex,
    int toIndex)
Returns a view of the elements within me
between the specified fromIndex, inclusive, and
toIndex, exclusive. The returned LongList
is backed by me, so that any changes in
the returned list are reflected in me, and vice-versa.
The returned list supports all of the optional operations
that I support.

Note that when fromIndex == toIndex,
the returned list is initially empty, and when
fromIndex == 0 && toIndex == size() 
the returned list is my "improper" sublist, containing all my elements.

The semantics of the returned list become undefined
if I am structurally modified in any way other than
via the returned list.