public Object previous()
{
checkModCount();
if (!hasPrevious())
{
throw new java.util.NoSuchElementException("Already at start of list.");
}
if (nextJ == null)
{
nextJ = parent.root.get(nextIndexJ - 1);
}
else
{
nextJ = nextJ.previous();
}
Object value = nextJ.getValue();
current = nextJ;
currentIndex = --nextIndexJ;
return(value);
}